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Bending ply
Hi
I'm looking to replace some rotten plywood on the cabin top. 60's motor launch. Original construction looks like 15 mm ply ( probably marine back then - it wasn't gold plated .. ) with fibreglass on top, and many many layers of paint. If they had glassed over the front lip ( like an eyebrow over the slanting windows ) the water would not have penetrated back into the ply. Please excuse my terminology - probably get this mostly wrong .... My plan is to cut away all the ply back to the middle of the second "roof beam" - everything forward of this has some problem or other. Then to fit a new piece of 15 mm waterproof ply ( "C/D"), pre-sealed with a couple of coats of epoxy all over. Add a glass sheath to the top and over the front lip ( I figure the original was polyester, but I've got to use epoxy or else it won't stick, right?), try to make the join invisible by lots of filling / sanding / cursing, and eventually painting it all again. I've got as far as making a template of the shape ( removed the grab rails, screwed a piece of 3 mm ply to the roof, drilled holes from inside the cabin next to the beams, scribed around the front edge, removed template, filled the drill holes with 5 minute epoxy, replaced grab rails .... ), but I have one concern. The cabin top has about 1 1/2 inch of camber from centre to edge each side. It's about 6 ft wide. Am I going to be able to bend the sheet of 15 mm epoxy impregnated waterproof ply to follow the camber? I can't get clamps anywhere, but I plan on using lots of SS screws to pull it down onto an epoxy adhesive bedding, then removing the screws after the glue has set, and filling the screw holes before I glass over the top. And if I'm realistically not going to be able to bend the ply, what is "Plan B" David |
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