Sailing Uma · video

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The crew of the 40-foot sailboat Uma performs structural integrity tests on their hull refit after a test laminate sample delaminated unexpectedly. During the initial fiberglassing phase, the team used vinyl ester resin and peel ply to reinforce the hull with ribs and stringers.1:10 When a replica test piece failed a hammer impact test by popping off in a clean sheet, the crew feared the structural bonds inside the actual hull were compromised.1:36 After consulting with professional boat builders, they identified surface contamination and lack of mechanical keying as potential causes.2:23 The crew conducted a series of controlled tests on new samples, comparing bonding methods including cleaning with acetone, grinding with 80-grit sandpaper, and using peel ply alone.12:06 They also stress-tested the actual hull by striking it with a hammer through a block of wood, confirming no delamination occurred on the boat itself.6:36 The experiments proved that cleaning with acetone followed by grinding to create a rough surface provides a superior mechanical bond compared to laminating directly over peel ply.15:37 Proper surface preparation, specifically grinding to open fibers, ensures structural integrity in fiberglass repairs.

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