It is the problem we see most often on composite hulls in service, and also the one owners discover too late. Delamination is not dramatic at first. That is precisely what makes it expensive.<\/p>\n
A polyester hull is made of layers of glass fiber impregnated with resin, stacked and bonded together. Its strength does not come from the fibers alone, but from the cohesion between the layers.<\/p>\n
Delamination is the breakdown of that cohesion. Water gets in through an impact, a hairline crack in the gelcoat or a poorly sealed hull penetration, and spreads between the layers. The area loses its local stiffness, flexes more under load, and the damage spreads by itself.<\/p>\n
The first clue is sound<\/strong>. Sound laminate rings solid under a mallet. A delaminated area sounds hollow, dull, slightly cavernous. It is the simplest test, and any skipper can do it himself during a haul-out.<\/p>\n The second is visual<\/strong>: a slight bulge in the gelcoat, a star-shaped network of hairline cracks around an old impact, a duller patch on the dry hull.<\/p>\n The third is behavioral<\/strong>, and it comes last: creaking in a specific area at sea, unusual vibrations, a piece of deck equipment whose fastening keeps working loose. By the time a vessel gets there, the affected area is already large.<\/p>\n The rule is simple: the area to be treated grows, and so does the nature of the work.<\/p>\n Delamination of a few dozen square centimeters, caught in time, is handled as a surface repair: opening, drying, rebuilding a few layers, gelcoat. The vessel is back at sea within days.<\/p>\n The same defect ignored for two seasons can reach several square meters and affect a structural area. Equipment then has to be removed, a complete laminate rebuilt and distortion checked, and downtime is counted in weeks. Between the two scenarios, the cost ratio often exceeds a factor of five.<\/p>\n Everything starts with mapping<\/strong>. Systematic tapping with a mallet and moisture meter readings let us mark out in pencil the real boundary of the delamination, which is almost always larger than the visible impact suggested.<\/p>\n Next comes opening up the area and, above all, complete drying<\/strong>. This is the step that cannot be rushed: laminating onto a damp substrate guarantees the delamination will return in the short term. We take the time needed, and we check.<\/p>\n The laminate is then rebuilt with a progressive scarf, a lay-up equivalent to the original laminate and a bond onto sound substrate. Finally comes the surface restoration: progressive sanding, filler, gelcoat and paint.<\/p>\n Use every haul-out to tap the hull, focusing on high-risk areas: the underwater hull at fender height, around hull penetrations, the transom, and any previous repair.<\/p>\n If in doubt, we come to you. An on-site survey always costs less than an emergency structural repair in the middle of the season.<\/p>\n","protected":false},"excerpt":{"rendered":" Delamination is the most common problem on composite hulls in service. Treated early, it costs little. Ignored for two seasons, it becomes structural.<\/p>\n","protected":false},"author":1,"featured_media":3293,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[112],"tags":[],"class_list":["post-3405","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-composite-repair-en"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":8}},"meta_box":[],"_links":{"self":[{"href":"https:\/\/www.plastipeche.com\/en\/wp-json\/wp\/v2\/posts\/3405","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.plastipeche.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.plastipeche.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.plastipeche.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.plastipeche.com\/en\/wp-json\/wp\/v2\/comments?post=3405"}],"version-history":[{"count":1,"href":"https:\/\/www.plastipeche.com\/en\/wp-json\/wp\/v2\/posts\/3405\/revisions"}],"predecessor-version":[{"id":3406,"href":"https:\/\/www.plastipeche.com\/en\/wp-json\/wp\/v2\/posts\/3405\/revisions\/3406"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.plastipeche.com\/en\/wp-json\/wp\/v2\/media\/3293"}],"wp:attachment":[{"href":"https:\/\/www.plastipeche.com\/en\/wp-json\/wp\/v2\/media?parent=3405"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.plastipeche.com\/en\/wp-json\/wp\/v2\/categories?post=3405"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.plastipeche.com\/en\/wp-json\/wp\/v2\/tags?post=3405"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Why waiting is expensive<\/h2>\n
Our repair protocol<\/h2>\n
The habit to adopt<\/h2>\n