Originally Posted by Jeff_H
Plywood is often used for backing plates, but as SailingDog notes, the plywood should be epoxy saturated once drilled for all of the fastenings. I would suggest using MAS epoxy since thier penetrating epoxy does not produce an amine blush, which with other brands may interfere with the bond between the sealant and the backing plate.
If your hull is cored the coring should be cut back and the core space filled with solid thickened epoxy. Another better solution is to cut away the inner skin and remove the core and then build up solid glass and epoxy, tapering out onto the inner and outer skins.
Which brings me to my favorite backing plate method, which is to simply build up layers epoxy and fiberglass with a tapered edge.
Yup...but that requires a lot more effort than cutting a slab of marine ply and coating it in epoxy. The point about MAS expoy is a good one... unless you feel like washing off the amine blush after the epoxy cures.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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