It depends on how you plan on applying the primer & paint.

Are you going to use spray equipment, such as a professional style spray gun & air compressor? Or are you planning on using commercially available aerosol cans?

I used the latter & still achieved a professional body shop quality finish. Of course I also took my time & made certain the surface was prepared properly as well as applying the primer & paint in several light, even coats.

If I remember correctly I purchased my paint & primer at the local auto parts store or discount department store.

1999 SVT Contour, #2140 of 2760, Tropic Green - Medium Prairie Tan
Koni Sport struts; TSW Blade wheels; Nakamichi, a/d/s/, Boston Acoustics, Infinity I.C.E.

1989 Saleen Mustang, #89-0408, too many mods to list here