Paint the wooden keel inside

[urisvan]

I bought a small dinghy and it has a wooden keel. I made some comprehensive repairs and fittings. Now i need the paint the interior.
She has a pretty thick(around 20cm wide) wooden keel. Which type of paint i should use? Should i worry about breathability? For example, if it takes some moisture from outside, it should be able to breath inside and give the moisture away from inside.

 

[gonzo]

Wood does not breathe. That is a notion that keeps on coming up. All materials absorb moisture to some extent. Oil based (alkyd) paint works fine on wood. Also, there is a difference between waterproof and vapor proof. Vapor may permeate waterproof materials. A really good example is Gore-Tex.