Cyber- I could swear I've seen orange in quarts, and maybe safety orange in gallons. You tried the usual suspects Home depot and lowes?

If not, I bet brightside makes a nice orange you can get. So does Pettit, they have a product called easypoxy which is similar to brightside.

There is a marine store near me that carries brightside and easypoxy.. I'm planning to stop in and see what they have.