Parallax ) writes:

Tonight, got one centerboard box made, ran out of material (3" wide
material) for second. Decided not to enclose it before sealing and
painting it. Strange that the instructions do not specify painting
the inside before enclosing it.

On the one daggerboard trunk that I've made I gave the inside surfaces two
coats of polyester resin for abraision resistance, just the inside exposed
surface, leaving the gluing surfaces uncoated. To help the polyester
adhere to the plywood the first coat was put on uncatalysed and allowed to
soak in over night before the second catalysed coat was put on. Then the
inside surfaces were given two coats of polyurethane liquid plastic for
extra waterproofing. This was a winter project so had the luxury of lots
of time to allow things to cure. It was also a lower cost alternative to
coating the inside with epoxy resin. I reserved the more expensive epoxy
to gluing the daggerboard to the boat and sealing the slot with a couple
additional coats.


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