I would strongly recommend a two part finish. It is considerably harder and more resistant to chemicals, etc... I also noticed that the one part would wear much faster off the bottoms of the hulls from sliding cat tracks than the 2 part does. I would look at Interlux Perfection or I've also heard good things about the system 3 two part poly's. If you are going to go through all the trouble of sanding and prepping the surface, why skimp on the paint to be used? Perfection is about twice as much as the one part poly but I think the end result would be well worth it. Awl-Grip is also very good, but is a bit more difficult to use and about twice the price of perfection. Also, if you are going to spray, you need to make sure you have the right equipment and safety precautions (forced air respirator, etc...). Good Luck!