I just did a repair this weekend twice that size. Bought it from gelcote. They make the factory cote for Sea Doo. ITs only 30 bucks but 20 to ship it. Came with everything you need but tape and something to mix it in. You can buy a universal kit at bass pro or overtons if you have one close to yuo. For an area under the boat that nobody sees, it would be fine. After the repair, you see it because the original stuff has faded over years, so really having the original color is no big deal. Very easy to use, just dont put too much on. I made that mistake and was sanding a long time.