BoatworksToday · video

What this video covers

Fabricating a custom fiberglass hatch for a Bertram 25 requires preparing a mold using OSB and chopped strand mat.0:20 To ensure the fiberglass lays flat, always request that suppliers ship fabric rolled rather than folded to prevent kinking or creasing the fibers.7:56 When prepping the mold, prioritize fairing and sanding the final part rather than the mold surface to save time.6:18 For the mold skin, flood the porous OSB surface with catalyzed non-waxed laminating polyester resin before applying the chopped strand mat to ensure a strong bond.9:31 Use torn strips of mat around the perimeter to create wispy edges that blend smoothly without creating hard humps.8:51 When working with polyester resin, spread the mixture into a thin film immediately after application to extend the working time and prevent the resin from overheating in the mixing cup.11:13

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