@KED_ MAN I used Rustolium (i think that's how it is spelled.) I got it at WALMART. i put 2 or 3 coats on the bottom and 3 coats on the inside of the boat. worked out well.
@Henricogolfer It gets a little warm but nothing to bad. I decked mine so it would not be a problem for me. But the cool temp of the water should cool it as well. You can get bed liner in all different colors. so if black isn't your color or you want a different color you can get it in red, green, blue, grey, and white. also once it is dry wait a couple days and you can paint it. A buddy of mine did and it came out pretty good. if you paint it brush the rino lining on instead of using a roller or sprayer. it makes it easy and looks clean. If you have anymore questions feel free to drop me a line. hope that helps a little.