Fiberglass – epoxy
I recommend an initial (and minimal) coating of epoxy before laying out the cloth. The reason is that with a filled wooden structure it is much easier to control the wetting out of the cloth.
The cloth is quite flexible and can be shaped over most hulls without any wrinkles. Then pour a small batch of mixed epoxy on top of the keel and work it over the surface with a rubber squeegee. Repeat until the cloth is wetted out - i e invisible.
When the epoxy has set (normally overnight), lift the hull from the molds, turn it right side up on a couple of supports - ideally the leftovers from the particleboard you cut the molds from
The inside is then treated the same way as the outside: sanding, coating, applying and wetting out the cloth (on the wall in the left you can see two of my longboards).
That done, and the epoxy cured, it is time to start building the deck…
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