{"id":32796,"date":"2026-01-12T15:21:47","date_gmt":"2026-01-12T15:21:47","guid":{"rendered":"https:\/\/www.estilguru.com\/polyurethane-mastic-vs-polymer-ms\/"},"modified":"2026-01-12T15:21:50","modified_gmt":"2026-01-12T15:21:50","slug":"polyurethane-mastic-vs-polymer-ms","status":"publish","type":"post","link":"https:\/\/www.estilguru.com\/en\/polyurethane-mastic-vs-polymer-ms\/","title":{"rendered":"Polyurethane putty vs MS polymer Which one to use in each case?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"32796\" class=\"elementor elementor-32796 elementor-32775\" data-elementor-settings=\"{&quot;ha_cmc_init_switcher&quot;:&quot;no&quot;}\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-740de73 e-flex e-con-boxed e-con e-parent\" data-id=\"740de73\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0f9e198 elementor-widget elementor-widget-text-editor\" data-id=\"0f9e198\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Polyurethane mastic, also known as PU, is often confused with MS polymer, but we should know that each has its own advantages and functions.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3125d92 e-flex e-con-boxed e-con e-parent\" data-id=\"3125d92\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5f71f84 elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"5f71f84\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;exclude_headings_by_selector&quot;:[],&quot;headings_by_tags&quot;:[&quot;h2&quot;,&quot;h3&quot;,&quot;h4&quot;,&quot;h5&quot;,&quot;h6&quot;],&quot;marker_view&quot;:&quot;numbers&quot;,&quot;no_headings_message&quot;:&quot;No headings were found on this page.&quot;,&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<h4 class=\"elementor-toc__header-title\">\n\t\t\t\tTable of Contents\t\t\t<\/h4>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__5f71f84\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><i aria-hidden=\"true\" class=\"fas fa-chevron-down\"><\/i><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__5f71f84\" aria-expanded=\"true\" aria-label=\"Close table of contents\"><i aria-hidden=\"true\" class=\"fas fa-chevron-up\"><\/i><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__5f71f84\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<i class=\"elementor-toc__spinner eicon-animation-spin eicon-loading\" aria-hidden=\"true\"><\/i>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7715dc8 e-flex e-con-boxed e-con e-parent\" data-id=\"7715dc8\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4cd6fc6 elementor-widget elementor-widget-text-editor\" data-id=\"4cd6fc6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The two products perform similar functions, but they <strong>are not the same and do not behave in the same way<\/strong>. Making the wrong choice can result in premature cracking, adhesion problems or less durability than expected. Below we will take an in-depth look at the differences between <strong>polyurethane mastic vs. MS polymer <\/strong>and why, in many scenarios today, MS polymer such as <strong>W-S Mastic<\/strong> is the more complete choice.  <\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-572025e e-flex e-con-boxed e-con e-parent\" data-id=\"572025e\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7dc3385 elementor-widget elementor-widget-text-editor\" data-id=\"7dc3385\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><strong>What is polyurethane (PU) mastic?<\/strong><\/h2>\n<p><strong>Polyurethane putty<\/strong> is an elastic adhesive sealant that <strong>cures by reaction with ambient humidity<\/strong>. It has been used for decades in construction because of its good mechanical strength and its ability to absorb moderate movements. <\/p>\n<p>It is usually found in:<\/p>\n<ul>\n<li>Expansion joints<\/li>\n<li>Structural seals<\/li>\n<li>Facades and roofs<\/li>\n<li>Prefabricated elements<\/li>\n<\/ul>\n<p>Its fame is due to its <strong>resistance and reliability<\/strong>, although it also has some limitations that are worth knowing.<\/p>\n<h2><strong>What is MS polymer?<\/strong><\/h2>\n<p><strong>MS (Modified Silane) polymer<\/strong> is a newer technology that combines the advantages of polyurethane and silicones, eliminating many of their drawbacks.<\/p>\n<p>Products such as <strong>W-S Mastic<\/strong> belong to this family and are characterized by:<\/p>\n<ul>\n<li>High permanent elasticity<\/li>\n<li>Excellent adhesion without primer<\/li>\n<li>Very low VOC emissions<\/li>\n<li>High resistance to weathering and UV rays<\/li>\n<\/ul>\n<p>For this reason, they are increasingly used in <strong>waterproofing, technical sealing and demanding bonding<\/strong> applications.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8c79fbe e-flex e-con-boxed e-con e-parent\" data-id=\"8c79fbe\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-94271d2 elementor-widget elementor-widget-text-editor\" data-id=\"94271d2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><strong>Key differences between polyurethane and MS polymer mastic<\/strong><\/h2>\n<p><strong>Elasticity and movements<\/strong><\/p>\n<p>PU putty is elastic, but may <strong>harden slightly<\/strong> over time, especially outdoors.<br \/>MS polymer maintains its <strong>elasticity for years<\/strong>, making it ideal for areas with constant vibration or expansion.<\/p>\n<p><strong>Resistance to UV rays<\/strong><\/p>\n<p>One of the major weaknesses of PU is its <strong>performance in the sun<\/strong>. Outdoors it can yellow or degrade.<br \/>MS polymer offers <strong>excellent UV resistance<\/strong>, even in exposed applications. Ideal as a sealing complement for <a href=\"https:\/\/www.estilguru.com\/en\/waterproofing-roofs\/\">waterproofing roofs<\/a>.  <\/p>\n<p><strong>Odor and sustainability<\/strong><\/p>\n<p>Polyurethane mastic tends to be <strong>more odorous<\/strong> and has a higher VOC content.<br \/>MS polymer, such as W-S Mastic, has <strong>a very low VOC content<\/strong>, making it safer for interiors and poorly ventilated spaces.<\/p>\n<p><strong>Comparison chart: polyurethane mastic vs MS polymer<\/strong><\/p>\n<table>\n<thead>\n<tr>\n<td>\n<p><strong>Feature<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>Polyurethane (PU) mastic<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>MS Polymer (W-S Mastic)<\/strong><\/p>\n<\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\n<p>Curing<\/p>\n<\/td>\n<td>\n<p>Moisture<\/p>\n<\/td>\n<td>\n<p>Moisture<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Elasticity<\/p>\n<\/td>\n<td>\n<p>Good<\/p>\n<\/td>\n<td>\n<p>Very high and stable<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Shore A hardness<\/p>\n<\/td>\n<td>\n<p>Medium-high<\/p>\n<\/td>\n<td>\n<p>Medium (more flexible)<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Elongation<\/p>\n<\/td>\n<td>\n<p>400-600 %<\/p>\n<\/td>\n<td>\n<p>600 %<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>UV resistance<\/p>\n<\/td>\n<td>\n<p>Media<\/p>\n<\/td>\n<td>\n<p>Very high<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Adherence<\/p>\n<\/td>\n<td>\n<p>Very good (sometimes with primer)<\/p>\n<\/td>\n<td>\n<p>Excellent without primer<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Odor<\/p>\n<\/td>\n<td>\n<p>Medium<\/p>\n<\/td>\n<td>\n<p>Very low<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>VOC<\/p>\n<\/td>\n<td>\n<p>Medium<\/p>\n<\/td>\n<td>\n<p>Very low<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Outdoor use<\/p>\n<\/td>\n<td>\n<p>Correct<\/p>\n<\/td>\n<td>\n<p>Excellent<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Compatibility with foils<\/p>\n<\/td>\n<td>\n<p>Variable<\/p>\n<\/td>\n<td>\n<p>Optimum (WATER-STOP)<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-31fd24a e-flex e-con-boxed e-con e-parent\" data-id=\"31fd24a\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8e8a218 elementor-widget elementor-widget-image\" data-id=\"8e8a218\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.estilguru.com\/wp-content\/uploads\/2026\/01\/detalle-escalera-1024x576.jpg\" class=\"attachment-large size-large wp-image-32786\" alt=\"esquina sellada con polimero MS\" srcset=\"https:\/\/www.estilguru.com\/wp-content\/uploads\/2026\/01\/detalle-escalera-1024x576.jpg 1024w, https:\/\/www.estilguru.com\/wp-content\/uploads\/2026\/01\/detalle-escalera-300x169.jpg 300w, https:\/\/www.estilguru.com\/wp-content\/uploads\/2026\/01\/detalle-escalera-768x432.jpg 768w, https:\/\/www.estilguru.com\/wp-content\/uploads\/2026\/01\/detalle-escalera-600x338.jpg 600w, https:\/\/www.estilguru.com\/wp-content\/uploads\/2026\/01\/detalle-escalera.jpg 1344w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-9466d04 e-flex e-con-boxed e-con e-parent\" data-id=\"9466d04\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a73a944 elementor-widget elementor-widget-text-editor\" data-id=\"a73a944\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3><strong>When to use polyurethane putty?<\/strong><\/h3>\n<p><strong>PU putty<\/strong> remains a valid option when:<\/p>\n<ul>\n<li><strong>High mechanical strength<\/strong> is required<\/li>\n<li>The application is not exposed to direct sunlight<\/li>\n<li>Odor or VOC content is not critical.<\/li>\n<li>It is a standard and cost-effective solution<\/li>\n<li>Perfect grip with current market solutions such as <a href=\"https:\/\/www.estilguru.com\/en\/sheets-waterproof\/waterproofing-membrane-water-stop\/\">waterproofing sheets<\/a><\/li>\n<\/ul>\n<p>In traditional work, it is still a functional product and known to many applicators.<\/p>\n<h3><strong>When is an MS polymer such as W-S Mastic better?<\/strong><\/h3>\n<p><strong>MS polymer<\/strong> is the best choice when:<\/p>\n<ul>\n<li>There are <strong>constant movements or vibrations<\/strong><\/li>\n<li>The sealing will be <strong>exposed to weathering<\/strong><\/li>\n<li>Work is carried out in <strong>inhabited interiors<\/strong><\/li>\n<li><strong>Compatibility with waterproof sheeting<\/strong> required<\/li>\n<li>A <strong>durable and versatile<\/strong> solution is sought<\/li>\n<\/ul>\n<p>In the specific case of <strong>W-S Mastic<\/strong>, its formulation makes it especially suitable for:<\/p>\n<ul>\n<li>Sealing and bonding of WATER-STOP\u00ae sheets<\/li>\n<li>Waterproofing of overlaps<\/li>\n<li>Structural bonding with vibration<\/li>\n<li>Ventilation and air conditioning<\/li>\n<li>Demanding applications in construction.<\/li>\n<\/ul>\n<h4><strong>Benefits and key features of PU polyurethane mastic and MS polymers  <\/strong><\/h4>\n<table>\n<thead>\n<tr>\n<td>\n<p><strong>Key aspect<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>PU putty<\/strong><\/p>\n<\/td>\n<td>\n<p><strong>W-S Mastic (MS Polymer)<\/strong><\/p>\n<\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\n<p>Ease of application<\/p>\n<\/td>\n<td>\n<p>Good<\/p>\n<\/td>\n<td>\n<p>Very high<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Long-term stability<\/p>\n<\/td>\n<td>\n<p>Media<\/p>\n<\/td>\n<td>\n<p>Very high<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Indoor safety<\/p>\n<\/td>\n<td>\n<p>Media<\/p>\n<\/td>\n<td>\n<p>High<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>External resistance<\/p>\n<\/td>\n<td>\n<p>Correct<\/p>\n<\/td>\n<td>\n<p>Excellent<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Versatility of use<\/p>\n<\/td>\n<td>\n<p>Media<\/p>\n<\/td>\n<td>\n<p>Very high<\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p>Advanced technical solution<\/p>\n<\/td>\n<td>\n<p>No<\/p>\n<\/td>\n<td>\n<p>Yes<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-02f47d3 e-flex e-con-boxed e-con e-parent\" data-id=\"02f47d3\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f6337dc elementor-widget elementor-widget-html\" data-id=\"f6337dc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>.faqs-pu-ms {\n  margin-top: 40px;\n  padding: 30px;\n  background-color: #f9f9f9;\n  border-radius: 12px;\n  border: 1px solid #e0e0e0;\n}\n\n.faqs-pu-ms h2 {\n  font-size: 1.6em;\n  margin-bottom: 20px;\n  color: #1a1a1a;\n  text-align: left;\n}\n\n.faqs-pu-ms .faq-item {\n  margin-bottom: 25px;\n  padding-bottom: 20px;\n  border-bottom: 1px solid #ddd;\n}\n\n.faqs-pu-ms .faq-item:last-child {\n  border-bottom: none;\n}\n\n.faqs-pu-ms .faq-item h3 {\n  font-size: 1.1em;\n  font-weight: 600;\n  color: #333;\n  margin-bottom: 8px;\n  position: relative;\n  padding-left: 20px;\n}\n\n.faqs-pu-ms .faq-item h3::before {\n  content: \"\u2022\";\n  position: absolute;\n  left: 0;\n  color: #0078AA;\n  font-weight: bold;\n}\n\n.faqs-pu-ms .faq-item p {\n  margin: 0;\n  line-height: 1.6;\n  color: #555;\n  font-size: 0.95em;\n}\n<\/style><div class=\"faqs-pu-ms\"><h2>Preguntas frecuentes sobre masilla de poliuretano vs pol\u00edmero MS<\/h2><div class=\"faq-item\"><h3>\u00bfQu\u00e9 diferencia hay entre masilla de poliuretano (PU) y pol\u00edmero MS?<\/h3><p>Aunque ambos productos se utilizan para sellar y pegar, su comportamiento es distinto. La masilla de poliuretano puede endurecerse con el tiempo, mientras que el pol\u00edmero MS mantiene una elasticidad m\u00e1s estable. Ejemplos de pol\u00edmero MS como W-S Mastic de GURU destacan por su durabilidad y versatilidad.<\/p><\/div><div class=\"faq-item\"><h3>\u00bfCu\u00e1l es mejor para exteriores: masilla PU o pol\u00edmero MS?<\/h3><p>En exteriores, el pol\u00edmero MS suele ser la mejor opci\u00f3n. Productos como W-S Mastic de GURU ofrecen una excelente resistencia a los rayos UV y a la intemperie, mientras que la masilla PU puede degradarse o amarillear si queda expuesta al sol.<\/p><\/div><div class=\"faq-item\"><h3>\u00bfEl pol\u00edmero MS es adecuado para interiores habitados?<\/h3><p>S\u00ed. Los pol\u00edmeros MS, como W-S Mastic de GURU, tienen muy bajo olor y baja emisi\u00f3n de COV, lo que los hace m\u00e1s seguros para interiores, especialmente en viviendas, oficinas o espacios poco ventilados.<\/p><\/div><div class=\"faq-item\"><h3>\u00bfCu\u00e1ndo conviene utilizar masilla de poliuretano (PU)?<\/h3><p>La masilla PU sigue siendo v\u00e1lida cuando se buscan altas resistencias mec\u00e1nicas, la aplicaci\u00f3n no est\u00e1 expuesta directamente al sol y no es cr\u00edtico el olor o el contenido en COV. Es una soluci\u00f3n habitual en obra tradicional.<\/p><\/div><div class=\"faq-item\"><h3>\u00bfCu\u00e1ndo es mejor elegir un pol\u00edmero MS como W-S Mastic de GURU?<\/h3><p>Es especialmente recomendable cuando existen movimientos constantes, vibraciones, exposici\u00f3n a la intemperie o cuando se necesita compatibilidad con sistemas de impermeabilizaci\u00f3n modernos como l\u00e1minas impermeabilizantes.<\/p><\/div><div class=\"faq-item\"><h3>\u00bfQu\u00e9 producto es m\u00e1s adecuado para juntas con movimiento?<\/h3><p>Para juntas sometidas a dilataciones frecuentes, el pol\u00edmero MS suele ofrecer mejores resultados. Soluciones como W-S Mastic de GURU conservan su elasticidad a largo plazo y reducen el riesgo de fisuras.<\/p><\/div><div class=\"faq-item\"><h3>\u00bfHace falta imprimaci\u00f3n con masilla PU o con pol\u00edmero MS?<\/h3><p>En muchos soportes, la masilla de poliuretano puede requerir imprimaci\u00f3n previa. En cambio, los pol\u00edmeros MS como W-S Mastic de GURU presentan una excelente adherencia sin necesidad de imprimar en la mayor\u00eda de superficies.<\/p><\/div><div class=\"faq-item\"><h3>\u00bfQu\u00e9 sellador es m\u00e1s compatible con l\u00e1minas impermeabilizantes?<\/h3><p>El pol\u00edmero MS es la opci\u00f3n m\u00e1s compatible con l\u00e1minas impermeabilizantes. W-S Mastic de GURU est\u00e1 espec\u00edficamente formulado para trabajar junto a sistemas como Water-Stop, garantizando estanqueidad y durabilidad.<\/p><\/div><div class=\"faq-item\"><h3>\u00bfQu\u00e9 soluci\u00f3n ofrece mayor durabilidad a largo plazo?<\/h3><p>Aunque la masilla PU es resistente, el pol\u00edmero MS ofrece una estabilidad superior con el paso del tiempo. Productos como W-S Mastic de GURU mantienen sus propiedades el\u00e1sticas durante a\u00f1os, incluso en condiciones exigentes.<\/p><\/div><div class=\"faq-item\"><h3>\u00bfEs el pol\u00edmero MS una soluci\u00f3n m\u00e1s avanzada que la masilla PU?<\/h3><p>S\u00ed. El pol\u00edmero MS representa una evoluci\u00f3n tecnol\u00f3gica que combina alta elasticidad, resistencia UV, bajo impacto ambiental y gran versatilidad, lo que lo convierte en una soluci\u00f3n m\u00e1s completa para aplicaciones modernas.<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-cacce59 e-flex e-con-boxed e-con e-parent\" data-id=\"cacce59\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;_ha_eqh_enable&quot;:false}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-27c004f elementor-widget elementor-widget-html\" data-id=\"27c004f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<script type=\"application\/ld+json\">{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n\n    {\n      \"@type\": \"Question\",\n      \"name\": \"\u00bfQu\u00e9 diferencia hay entre masilla de poliuretano y pol\u00edmero MS?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"La masilla de poliuretano puede perder elasticidad con el tiempo, mientras que el pol\u00edmero MS mantiene una elasticidad estable. Ejemplos como W-S Mastic de GURU destacan por su mayor durabilidad.\"\n      }\n    },\n\n    {\n      \"@type\": \"Question\",\n      \"name\": \"\u00bfCu\u00e1l es mejor para exteriores, PU o pol\u00edmero MS?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"El pol\u00edmero MS suele ser mejor para exteriores por su resistencia a los rayos UV y a la intemperie. Productos como W-S Mastic de GURU mantienen sus propiedades incluso en exposici\u00f3n directa.\"\n      }\n    },\n\n    {\n      \"@type\": \"Question\",\n      \"name\": \"\u00bfEl pol\u00edmero MS es adecuado para interiores?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"S\u00ed. Los pol\u00edmeros MS como W-S Mastic de GURU tienen bajo olor y baja emisi\u00f3n de COV, siendo m\u00e1s seguros para interiores habitados.\"\n      }\n    },\n\n    {\n      \"@type\": \"Question\",\n      \"name\": \"\u00bfCu\u00e1ndo conviene usar masilla de poliuretano?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"La masilla de poliuretano es adecuada cuando se buscan altas resistencias mec\u00e1nicas y la aplicaci\u00f3n no est\u00e1 expuesta al sol ni a condiciones ambientales exigentes.\"\n      }\n    },\n\n    {\n      \"@type\": \"Question\",\n      \"name\": \"\u00bfCu\u00e1ndo es mejor elegir un pol\u00edmero MS como W-S Mastic de GURU?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Es la mejor opci\u00f3n cuando hay movimientos constantes, exposici\u00f3n a la intemperie o necesidad de compatibilidad con sistemas de impermeabilizaci\u00f3n modernos.\"\n      }\n    },\n\n    {\n      \"@type\": \"Question\",\n      \"name\": \"\u00bfQu\u00e9 sellador es m\u00e1s compatible con l\u00e1minas impermeabilizantes?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"El pol\u00edmero MS es el m\u00e1s compatible. W-S Mastic de GURU est\u00e1 formulado para trabajar junto a l\u00e1minas impermeabilizantes como Water-Stop.\"\n      }\n    },\n\n    {\n      \"@type\": \"Question\",\n      \"name\": \"\u00bfQu\u00e9 soluci\u00f3n ofrece mayor durabilidad a largo plazo?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"El pol\u00edmero MS ofrece mayor estabilidad y durabilidad que la masilla PU. Productos como W-S Mastic de GURU mantienen su elasticidad durante a\u00f1os.\"\n      }\n    }\n\n  ]\n}\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Polyurethane mastic, also known as PU, is often confused with MS polymer, but we should know that each has its own advantages and functions. Table of Contents The two products perform similar functions, but they are not the same and do not behave in the same way. Making the wrong choice can result in premature &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.estilguru.com\/en\/polyurethane-mastic-vs-polymer-ms\/\"> <span class=\"screen-reader-text\">Polyurethane putty vs MS polymer Which one to use in each case?<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","footnotes":""},"categories":[236],"tags":[],"class_list":["post-32796","post","type-post","status-publish","format-standard","hentry","category-waterproofing"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Polyurethane putty vs MS polymer Which one to use in each case? - Estil Guru<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.estilguru.com\/en\/polyurethane-mastic-vs-polymer-ms\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Polyurethane putty vs MS polymer Which one to use in each case? - Estil Guru\" \/>\n<meta property=\"og:description\" content=\"Polyurethane mastic, also known as PU, is often confused with MS polymer, but we should know that each has its own advantages and functions. 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