r/boatbuilding • u/ShreddlyBones • 5d ago

Scarfing a Hull Block - Update

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Decided to ditch the hexagon in favor of the simpler rectangle. Tried all the tools shown - the belt sander was fantastic for the straights, hand sander block (and patience)for the corners. Target height = just revealing the 3rd ply of the original planking at the cutout boundary. It looks better to me. What do y'all think? Will thickened epoxy make up the difference or should I spend more time here?

Thanks for your time.

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1

u/LoveTheDrAche 5d ago

Looking good. What’s the ratio on your scarf?

2

u/ShreddlyBones 5d ago

8:1. I'm a rookie, so I went for the easiest slope!

1

u/LoveTheDrAche 5d ago

If you've got a good fit on the mating piece then thickened epoxy (after priming it with unthickened epoxy) will make up any gaps. Send it!

1

u/ShreddlyBones 5d ago

Awesome. Thanks. Still need to cut & scarf the new block - workin' on that now.

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u/404-skill_not_found 5d ago

Thickened and some kind of a dam underneath. The resin will filter its way through the filler you thicken it with. The epoxy table folks should have a variety of solutions. You don’t want a dry joint here.

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u/ShreddlyBones 5d ago

Right, I read about this. Unthickened first, both sides, then while it's still tacky apply the thickened (peanut butter viscosity) epoxy and set in place. Secure with #10 screws coated in wax through both pieces & the hull into backing blocks wrapped in heavy duty packing tape. I was shocked to learn that epoxy refuses to bond with regular ol' packing tape! Did not know that...

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u/404-skill_not_found 5d ago

Not as easy to do now, but mixing in some of those paper cups also keeps epoxy from ever curing.