Step 5: Waterproofing
Tip: Buy some paintbrushes from the dollar store so you don't have to clean them after you use them but can just throw them out when they're hardened. Also, milk jugs (not cartons) work well to put the epoxy in, but too much epoxy in it at once can melt the plastic.
I was talking to some people in the states and they said that I should paint it with a thick layer of waterproof paint. I insisted that epoxy would work. Well, both would probably work, but epoxy is clear and kinda like a shell. You can see the paper underneath, which is cool. It's your choice. I hear people use shellac as well.
By the way, if your boat gets wet, it'll disintegrate, so waterproof it well.