Nah, unless the paint on there is in really bad shape it's actually better to leave it there and just sand it enough to make the primer stick to it. The factory paint is baked on, it's going to adhere to the frame much better than any kind of rattle can spray paint you can get. I wouldn't use the can of paint that's been sitting in your garage for 10 years, most likely it's all clumped up and clogged, and if not you're still going to need a lot more than 1 can to paint a whole frame. It's just better to buy all new paint, that way you know it's good, and it will match. Metallic automotive paints tend to be very thin, meaning it will take 3 or 4 light coats to get it smooth and consistent without any of the basecoat showing through, then let it set for a couple days and follow up with several coats of good automotive primer, not $1 can bargain bin ****.