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Correcting a Sagging Solid Fiberglass Sailboat Deck!
January 18, 2026 · 13 min · 15K views
Worker pours resin onto a boat deck in workshop
What this video covers
To correct a half-inch sag in a solid fiberglass cabin top, Andy uses a large belt sander to shave down the high spots and create a uniform profile.▶ 4:48 Because the deck lacks coring, he rejects the idea of pushing the deck up from the interior, noting that the resulting tension would likely cause cracking or debonding.▶ 3:50 After sanding the area down by approximately one-quarter inch, he prepares the surface by removing the existing non-skid texture and cleaning the laminate.▶ 7:30 He applies 1708 fiberglass cloth with polyester resin, choosing polyester over epoxy for its faster cure time under cold shop conditions.▶ 8:09 He catalyzes the resin at 2% to ensure a quick set before finishing the remaining work.▶ 8:57 The repair maintains the deck's original camber to ensure proper water drainage.▶ 7:03 Any remaining low spots are addressed with fairing compound.▶ 6:39
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