House paint as topside paint?

[savannahbeach]

The guy who sold me my V20 either did not prime the gelcoat finish or used house paint, probably the former as most of it is still hanging on. So, I am going to have to sand the entire boat (topside).
You don't take a knife to a gunfight.
I have far more experience in painting/maintaining a couple of old properties on the coast. I bought a book from a very helpful, congenial fellow who operates historichomeworks - a genius, a guru, and down to earth guy. His explanation on paint was interesting. He explains that in humid areas - like the east coast, one uses latex for top coat because the vapors in the wood need to expel through the paint, versus the midwest where moisture isn't a problem one can use oil top coat. He then explains that house paint, especially latex is permeable enough to allow water transfer WHEREAS marine paint is impervious and prevents water from coming through. Two different animals.
I am looking a spray job with primer and 2 coat epoxy - in this lifetime or maybe the next...
But no knives or house paint.