To make the hull water tight I use a product called z-poxy it's a 2 part product mixed in hardener and resin of the same amounts and I use a layer of fibber cloth and them the z-poxy smooth as best you can about 30 min. time to use and then let harden over night at least 24 hours and them you can sand and finish with filler if needed or some more coats of z-poxy sanding after each coat.
Rick

SH-One-T happens!😲

reduce-reuse-recycle :)

No sh*t😂😂

because I am tight fisted and wanted to get my monies worth! 😜

Haverlock,
If the smell is an issue, why not try new nappy liners?

if you can stand the smell get some nappy liners and lay them on the hull then saturate with polyester resin ( + hardener). Once it set hard ( give it a week) you can sand it down with 600 used wet. Gives a smooth finish that is almost invisible. Sealed and hard wearing.

Hi Dave,
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 waterproofed the hull.
https://model-boats.com/builds/view/43305?goto=43306
Otherwise Haverlock is quite right too👍
I would have liked to have had a varnished 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😎

What type of boat/ship if its purely a sport boat you can cover the planking with tissue and dope then high build primer. Sand it down and paint with whatever takes your fancy. On the other hand if your wanting the planking to show ( scale type model) you need to seal the wood on the outside and inside with a decent varnish that should provide all sealing you need.