I would not waste all that paint! Thats a lot of cash!
If you wanted you could glass some wood and then just paint the top to match the deck, But heck if you are going to do that you might as well repair the cover you have there, there are a few posts here from people that have done it, its not all that hard!
Here is one read to the 2nd page! There are others out there, do a search
http://wellcraftv20.com/community/sh...gas+tank+cover