{"id":18803,"date":"2026-04-26T15:00:37","date_gmt":"2026-04-26T13:00:37","guid":{"rendered":"https:\/\/www.astro-piscines.ch\/?page_id=18803"},"modified":"2026-04-26T15:00:37","modified_gmt":"2026-04-26T13:00:37","slug":"polyester-pool-shell-renovation","status":"publish","type":"page","link":"https:\/\/www.astro-piscines.ch\/en\/pool-renovation\/polyester-pool-shell-renovation\/","title":{"rendered":"Renovation of polyester pool shells &#8211; Geneva &amp; Vaud"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column]\n\t\t\t<!-- START R\u00e9novation coque REVOLUTION SLIDER 6.7.38 --><p class=\"rs-p-wp-fix\"><\/p>\n\t\t\t<rs-module-wrap id=\"rev_slider_72_1_wrapper\" data-alias=\"Rnovation-coque\" data-source=\"gallery\" style=\"visibility:hidden;background:#111111;padding:0;margin:0px auto;margin-top:0;margin-bottom:0;\">\n\t\t\t\t<rs-module id=\"rev_slider_72_1\" style=\"\" data-version=\"6.7.38\">\n\t\t\t\t\t<rs-slides style=\"overflow: hidden; position: absolute;\">\n\t\t\t\t\t\t<rs-slide style=\"position: absolute;\" data-key=\"rs-224\" data-title=\"Slide\" data-in=\"o:0;\" data-out=\"a:false;\">\n\t\t\t\t\t\t\t<img decoding=\"async\" src=\"\/\/www.astro-piscines.ch\/wp-content\/plugins\/revslider\/sr6\/assets\/assets\/dummy.png\" alt=\"R\u00e9novation de coque piscine polyester par Astro Piscines dans le canton de Gen\u00e8ve et Vaud\" title=\"Renovation-de-coque-piscine-polyester-par-Astro-Piscines-dans-le-canton-de-Geneve-et-Vaud\" width=\"1920\" height=\"700\" class=\"rev-slidebg tp-rs-img rs-lazyload\" data-lazyload=\"\/\/www.astro-piscines.ch\/wp-content\/uploads\/2026\/04\/Renovation-de-coque-piscine-polyester-par-Astro-Piscines-dans-le-canton-de-Geneve-et-Vaud.jpg\" data-no-retina>\n<!--\n\t\t\t\t\t\t\t--><h1\n\t\t\t\t\t\t\t\tid=\"slider-72-slide-224-layer-1\" \n\t\t\t\t\t\t\t\tclass=\"rs-layer\"\n\t\t\t\t\t\t\t\tdata-type=\"text\"\n\t\t\t\t\t\t\t\tdata-color=\"#fff\"\n\t\t\t\t\t\t\t\tdata-tsh=\"h:5px,5px,5px,1px;v:5px,5px,5px,1px;b:10px,10px,10px,3px;\"\n\t\t\t\t\t\t\t\tdata-rsp_ch=\"on\"\n\t\t\t\t\t\t\t\tdata-xy=\"x:c;xo:5px,5px,5px,0;y:t,t,t,m;yo:109px,109px,109px,0;\"\n\t\t\t\t\t\t\t\tdata-text=\"w:normal;s:60,60,60,40;l:70,70,70,48;ls:-1,-1,-1,0;a:center;\"\n\t\t\t\t\t\t\t\tdata-dim=\"minh:0px,0px,0px,none;\"\n\t\t\t\t\t\t\t\tdata-frame_0=\"x:0,0,0,0px;y:0,0,0,0px;\"\n\t\t\t\t\t\t\t\tdata-frame_1=\"x:0,0,0,0px;y:0,0,0,0px;\"\n\t\t\t\t\t\t\t\tdata-frame_999=\"o:0;st:w;\"\n\t\t\t\t\t\t\t\tstyle=\"z-index:6;font-family:'Lato';text-transform:uppercase;\"\n\t\t\t\t\t\t\t>Swimming pool shell renovation \n\t\t\t\t\t\t\t<\/h1><!--\n\n\t\t\t\t\t\t\t--><rs-layer\n\t\t\t\t\t\t\t\tid=\"slider-72-slide-224-layer-2\" \n\t\t\t\t\t\t\t\tclass=\"astro-btn-2 rev-btn\"\n\t\t\t\t\t\t\t\tdata-type=\"button\"\n\t\t\t\t\t\t\t\tdata-color=\"rgba(255,255,255,1)\"\n\t\t\t\t\t\t\t\tdata-xy=\"x:c;y:m;yo:48px,48px,48px,95px;\"\n\t\t\t\t\t\t\t\tdata-text=\"s:14;l:14;fw:700;a:center;\"\n\t\t\t\t\t\t\t\tdata-actions='o:click;a:simplelink;target:_self;url:https:\/\/www.astro-piscines.ch\/en\/contact\/;'\n\t\t\t\t\t\t\t\tdata-rsp_bd=\"off\"\n\t\t\t\t\t\t\t\tdata-padding=\"t:18;r:45;b:18;l:45;\"\n\t\t\t\t\t\t\t\tdata-frame_0=\"y:-50px;\"\n\t\t\t\t\t\t\t\tdata-frame_1=\"e:power4.inOut;st:700;sp:1000;\"\n\t\t\t\t\t\t\t\tdata-frame_999=\"y:-50px;o:0;e:nothing;st:w;sp:1000;\"\n\t\t\t\t\t\t\t\tdata-frame_hover=\"bgc:#0b74e3;boc:#000;bor:0px,0px,0px,0px;bos:solid;oX:50;oY:50;sp:0;e:none;\"\n\t\t\t\t\t\t\t\tstyle=\"z-index:5;background-color:#0ba1e2;font-family:'Lato';text-transform:uppercase;cursor:pointer;outline:none;box-shadow:none;box-sizing:border-box;-moz-box-sizing:border-box;-webkit-box-sizing:border-box;\"\n\t\t\t\t\t\t\t>REQUEST A QUOTE \n\t\t\t\t\t\t\t<\/rs-layer><!--\n-->\t\t\t\t\t<\/rs-slide>\n\t\t\t\t\t<\/rs-slides>\n\t\t\t\t<\/rs-module>\n\t\t\t\t<script>\n\t\t\t\t\tsetREVStartSize({c: 'rev_slider_72_1',rl:[1240,1240,1240,480],el:[400,400,400,405],gw:[1600,1600,1600,720],gh:[400,400,400,400],type:'standard',justify:'',layout:'fullwidth',mh:\"0\"});if (window.RS_MODULES!==undefined && window.RS_MODULES.modules!==undefined && window.RS_MODULES.modules[\"revslider721\"]!==undefined) {window.RS_MODULES.modules[\"revslider721\"].once = false;window.revapi72 = undefined;if (window.RS_MODULES.checkMinimal!==undefined) window.RS_MODULES.checkMinimal()}\n\t\t\t\t<\/script>\n\t\t\t<\/rs-module-wrap>\n\t\t\t<!-- END REVOLUTION SLIDER -->\n[\/vc_column][\/vc_row][vc_row css=&#8221;.vc_custom_1765122949167{background-color: #FFFFFF !important;}&#8221;][vc_column][vc_column_text css=&#8221;&#8221;]<\/p>\n<h1>Renovation of polyester pool shells &#8211; Geneva &amp; Vaud<\/h1>\n<p>Is the gel coat on your polyester hull discolored, porous or grainy? Astro Piscines offers resurfacing and hull renovation solutions for pools in the Lake Geneva region.<\/p>\n<p>Over time, limescale is deposited on the walls of your pond. What is thought to be simple discoloration is often a layer of scale embedded on and under the surface of the gel coat. With our professional sanding and polishing service, your hull is restored to its original color, smooth texture and shine.<\/p>\n<p>Astro Piscines works on polyester hulls in the cantons of Geneva and Vaud to restore the aesthetics of your pool.<\/p>\n<p>&nbsp;[\/vc_column_text][vc_empty_space height=&#8221;5px&#8221;][vc_separator el_width=&#8221;80&#8243; css=&#8221;&#8221;][\/vc_column][\/vc_row][vc_row equal_height=&#8221;yes&#8221; css=&#8221;.vc_custom_1765347845690{background-color: #FFFFFF !important;}&#8221;][vc_column width=&#8221;2\/3&#8243;][vc_column_text css=&#8221;&#8221;]<\/p>\n<h2>Common problems with polyester hulls<\/h2>\n<table width=\"643\">\n<tbody>\n<tr>\n<td width=\"147\"><strong>Problem<\/strong><\/td>\n<td width=\"215\"><strong>Symptom<\/strong><\/td>\n<td width=\"281\"><strong>Our solution<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"147\"><strong>Calcareous deposits<\/strong><\/td>\n<td width=\"215\">whitish, granular surface<\/td>\n<td width=\"281\">\u2705 Full sanding + polishing<\/td>\n<\/tr>\n<tr>\n<td width=\"147\"><strong>Discoloration<\/strong><\/td>\n<td width=\"215\">Yellowed gel coat, dull color<\/td>\n<td width=\"281\">\u2705 Complete resurfacing<\/td>\n<\/tr>\n<tr>\n<td width=\"147\"><strong>Loss of gloss<\/strong><\/td>\n<td width=\"215\">Surface rough to the touch<\/td>\n<td width=\"281\">\u2705 Professional polishing<\/td>\n<\/tr>\n<tr>\n<td width=\"147\"><strong>Porous appearance<\/strong><\/td>\n<td width=\"215\">Micro-roughness on walls<\/td>\n<td width=\"281\">\u2705 Surface treatment + polishing<\/td>\n<\/tr>\n<tr>\n<td width=\"147\"><strong>Osmosis<\/strong><\/td>\n<td width=\"215\">Sub-surface blistering<\/td>\n<td width=\"281\">\u26a0\ufe0f Diagnosis + orientation<\/td>\n<\/tr>\n<tr>\n<td width=\"147\"><strong>Cracks<\/strong><\/td>\n<td width=\"215\">Star-shaped cracks<\/td>\n<td width=\"281\">\u26a0\ufe0f Diagnosis + orientation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>[\/vc_column_text][vc_empty_space height=&#8221;15px&#8221;][\/vc_column][vc_column width=&#8221;1\/3&#8243;][vc_single_image image=&#8221;18807&#8243; img_size=&#8221;full&#8221; alignment=&#8221;center&#8221; css=&#8221;&#8221;][\/vc_column][\/vc_row][vc_row full_width=&#8221;stretch_row_content&#8221; equal_height=&#8221;yes&#8221; content_placement=&#8221;middle&#8221; bg_type=&#8221;bg_color&#8221; bg_override=&#8221;full&#8221; css=&#8221;.vc_custom_1765347941866{margin-top: 50px !important;margin-bottom: 50px !important;}&#8221; bg_color_value=&#8221;#F5F5F5&#8243;][vc_column width=&#8221;1\/3&#8243; css=&#8221;.vc_custom_1776937543779{background-image: url(https:\/\/www.astro-piscines.ch\/wp-content\/uploads\/2026\/04\/Resultat-apres-polissage-professionnel-coque-piscine-retrouvant-sa-brillance.jpg?id=18808) !important;background-position: center !important;background-repeat: no-repeat !important;background-size: cover !important;}&#8221; offset=&#8221;vc_col-lg-6 vc_col-md-6 vc_hidden-xs&#8221;][\/vc_column][vc_column width=&#8221;1\/3&#8243; offset=&#8221;vc_hidden-lg vc_hidden-md vc_hidden-sm&#8221;][vc_single_image image=&#8221;18809&#8243; img_size=&#8221;full&#8221; css=&#8221;&#8221;][\/vc_column][vc_column width=&#8221;1\/3&#8243; offset=&#8221;vc_col-lg-6 vc_col-md-6&#8243;][vc_empty_space height=&#8221;5px&#8221;][vc_column_text css=&#8221;&#8221;]<\/p>\n<h2>Our solution: hull resurfacing and polishing<\/h2>\n<h3>Diagnosis and preparation<\/h3>\n<p>Before any intervention, our technicians carry out a complete diagnosis of your polyester hull. We identify the exact nature of the problem: scale deposits, gel coat wear, surface deterioration, or deeper degradation (osmosis, cracks). This step guarantees a targeted treatment and optimum results &#8211; or, if the problem goes beyond resurfacing, a referral to the most appropriate solution.<\/p>\n<h3>Complete sanding and polishing<\/h3>\n<p>We carry out a complete resurfacing of your hull, with full sanding and polishing. This tried-and-tested process removes encrusted limescale deposits from the walls and undersurface, restoring the original color, smooth texture and shine of your polyester hull.<\/p>\n<p>Our intervention restores your pool to its original appearance, without requiring replacement of the shell &#8211; an economical and sustainable solution for villa owners in Geneva, Nyon and throughout the canton of Vaud.[\/vc_column_text][vc_empty_space height=&#8221;15px&#8221;][\/vc_column][\/vc_row][vc_row equal_height=&#8221;yes&#8221; css=&#8221;.vc_custom_1765347898497{background-color: #FFFFFF !important;}&#8221;][vc_column width=&#8221;1\/2&#8243;][vc_empty_space height=&#8221;5px&#8221;][vc_column_text css=&#8221;&#8221;]<\/p>\n<h2>Osmosis, cracks, damaged hull: what to do?<\/h2>\n<p>Is your polyester hull showing blisters (osmosis), star cracks or deep damage? These problems are common after 15 to 20 years of use, and go beyond simple resurfacing.<\/p>\n<h3>Osmosis: an irreversible chemical problem<\/h3>\n<p>Osmosis is a chemical reaction between water and polyester resin that causes blisters to form under the surface of the gel coat. This phenomenon progressively weakens the structure of the hull. An anti-osmosis treatment may be considered, but in many cases, replacement of the hull is more economical and longer-lasting.<\/p>\n<h3>Structural cracks<\/h3>\n<p>Star cracks or through cracks can result from impact, ground movement or manufacturing defects. Depending on the severity of the damage, a badly damaged hull often warrants a complete replacement.<\/p>\n<h3>Our recommendations in the event of an irreparable hull<\/h3>\n<p>If the diagnosis reveals that your polyester shell is too damaged to be renovated, Astro Piscines can help you find two long-lasting solutions:<\/p>\n<p><a href=\"https:\/\/www.astro-piscines.ch\/en\/swimming-pool-construction\/swimming-pool-hull\/\"><strong>\u2192 Replacement with a new polyester shell<\/strong><\/a><\/p>\n<p>Installation of a new hull in your existing pool. Fast delivery, wide choice of shapes and colors. Link : \/en\/coque-piscine\/<\/p>\n<p><a href=\"https:\/\/www.astro-piscines.ch\/en\/swimming-pool-construction\/concrete-swimming-pool\/\"><strong>\u2192 Building a concrete swimming pool<\/strong><\/a><\/p>\n<p>Total freedom of shape, depth and size. An opportunity to modernize your equipment.<\/p>\n<h2>Limits of hull renovation<\/h2>\n<p>This is not possible with polyester hulls, regardless of the supplier:<\/p>\n<ul>\n<li>Changing the pool depth<\/li>\n<li>Creation of a masonry staircase<\/li>\n<li>Change of basin shape<\/li>\n<\/ul>\n<p>For these conversions, only concrete pools are eligible. See : <a href=\"https:\/\/www.astro-piscines.ch\/en\/pool-renovation\/modify-renovate-your-swimming-pool-structure-geneva-vaud\/\"><strong>Structural conversion<\/strong><\/a>.[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_single_image image=&#8221;18812&#8243; img_size=&#8221;full&#8221; css=&#8221;&#8221;][\/vc_column][\/vc_row][vc_row equal_height=&#8221;yes&#8221; bg_type=&#8221;bg_color&#8221; bg_override=&#8221;full&#8221; css=&#8221;.vc_custom_1765735559746{padding-bottom: 50px !important;}&#8221; bg_color_value=&#8221;#002D45&#8243;][vc_column][vc_column_text css=&#8221;&#8221;]<\/p>\n<h2 style=\"text-align: center;\"><span style=\"color: #ffffff;\"><strong>Yellowed, osmosed or cracked hull? We&#8217;ve got the solution. <\/strong><\/span><\/h2>\n<p>[\/vc_column_text][vc_empty_space height=&#8221;5px&#8221;][vc_column_text css=&#8221;&#8221;]<\/p>\n<h2 style=\"text-align: center;\"><span style=\"color: #ffffff;\">Service area<\/span><\/h2>\n<p style=\"text-align: center;\"><span style=\"color: #ffffff;\"><strong>Canton of Geneva: <\/strong>Geneva, Carouge, Versoix, Cologny, Meyrin, Th\u00f4nex, Ch\u00eane-Bougeries, Grand-Saconnex, Collonge-Bellerive, Vand\u0153uvres<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #ffffff;\"><strong>Canton of Vaud: <\/strong>Nyon, Lausanne, Morges, Rolle, Gland, Coppet, Prangins, Terre Sainte, Aubonne, La C\u00f4te<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #ffffff;\">Free diagnosis &#8211; resurfacing, new shell or concrete pool<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"color: #ffffff;\">0842 520 520<\/span><\/p>\n<p>[\/vc_column_text][vc_empty_space height=&#8221;15px&#8221;][vc_btn title=&#8221;Feasibility study and free quote&#8221; shape=&#8221;square&#8221; color=&#8221;primary&#8221; align=&#8221;center&#8221; css=&#8221;&#8221; el_class=&#8221;mon-bouton-bleum&#8221; link=&#8221;url:https%3A%2F%2Fwww.astro-piscines.ch%2Fen%2Fcontact%2F|title:Contact|&#8221;][\/vc_column][\/vc_row][vc_row equal_height=&#8221;yes&#8221; bg_type=&#8221;bg_color&#8221; bg_override=&#8221;full&#8221; css=&#8221;.vc_custom_1765735642345{padding-bottom: 50px !important;}&#8221; bg_color_value=&#8221;#F5F5F5&#8243;][vc_column][vc_column_text css=&#8221;&#8221;]<\/p>\n<h3>FAQ &#8211; Polyester hull renovation<\/h3>\n<p>[\/vc_column_text][vc_empty_space height=&#8221;5px&#8221;][vc_column_text css=&#8221;&#8221;]<\/p>\n<h3>How much does it cost to renovate a pool shell?<\/h3>\n<p>The budget depends on the size of the pool and the condition of the surface. Our sanding and polishing service is much more economical than hull replacement. Contact us for a free personalized quote.<\/p>\n<h3>How long does the procedure last?<\/h3>\n<p>Resurfacing by sanding and polishing usually takes 1 to 3 days, depending on the surface of the pool and the degree of soiling.<\/p>\n<h3>My hull is blistering (osmosis). Can you help?<\/h3>\n<p>We carry out a complete diagnosis to assess the extent of osmosis. If resurfacing isn&#8217;t enough, we can offer you replacement with a new polyester shell or the construction of a customized concrete pool &#8211; two solutions we master from A to Z.<\/p>\n<h3>My hull is cracked. Should I replace it?<\/h3>\n<p>Not necessarily. After diagnosis, some superficial cracks can be treated. On the other hand, if the structure is compromised, we can help you choose a new shell or concrete pool.<\/p>\n<h3>Can I change the color of a polyester shell?<\/h3>\n<p>Color change requires a new gel coat. If you&#8217;re planning a radical change, replacing the shell offers a complete choice of colors with a guaranteed finish.<\/p>\n<h3>How often should a polyester shell be renovated?<\/h3>\n<p>Professional polishing is recommended every 8 to 12 years, depending on routine maintenance, water quality and exposure to the elements.<\/p>\n<h3>How long does a polyester shell last?<\/h3>\n<p>A well-maintained polyester hull lasts 20 to 30 years. After that, if repairs become too costly, replacement or concrete is the wisest option.[\/vc_column_text][vc_empty_space height=&#8221;50px&#8221;][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][\/vc_column][\/vc_row][vc_row css=&#8221;.vc_custom_1765122949167{background-color: #FFFFFF !important;}&#8221;][vc_column][vc_column_text css=&#8221;&#8221;] Renovation of polyester pool shells &#8211; Geneva &amp; Vaud Is the gel coat on your polyester hull discolored, porous or grainy? Astro Piscines offers resurfacing and hull renovation solutions for pools in the Lake Geneva region. Over time, limescale is deposited on the walls of your pond. What is thought&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":16920,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_yoast_wpseo_focuskw":"Swimming pool conversion Geneva","_yoast_wpseo_title":"Pool Conversion | Depth, Stairs, Structure","_yoast_wpseo_metadesc":"Depth reduction, staircase creation, modernization of your pool in Geneva and Vaud. 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