I was faced with the same question last year when renovating and restoring the hull of an ancient Billing Boats Fish Cutter 'Gina 2' that I had inherited.
The Blog gives blow by blow account of how I stabilised and waterproof
ed the hull.
Otherwise Haverlock is quite right too👍
I would have liked to have had a varnish
ed wood finish but the original hull construction was so bad I had to fill it (after applying glass
-fibre tissue to the inside) and the green filler gave it a tortoise shell effect!!😲
have fun. Cheers, Doug😎