Depending on the damage of the paint chipping, you may want to sand down your flares with a finer grit sand paper and then paint them.
You can aerosol can plasti dip your flares and not worry about sanding, priming, etc. e
Just clean them as best as you can (pressure washer, sponge and soap) then wipe dry.
Get a clean rag with some Isopropyl alcohol and wipe them over once to make sure there nice and clean. Tape off ALL AREAS NOT BEING PAINTED and spray with plasti dip (avaible in black, white, red, clear and i think yellow)
Plasti dip (found at lowes, home depot, ace hardware, and internet) dries flexible and wont chip or crack to the bending of the flares. best of all, if you mess up or what to go back to OG color, they peel right off with some tease and force.