What to use for Fairing and Filling Holes?

[Mulv80]

I have some surperficial gelcoat cracks on the gunwale of my V20. The previous owner used a mooring cover so the boat has snaps all the way around the gunwale I would like to remove and patch the little screw holes. After patching the holes and cracks I will be painting from the rubrail up and including the inside and floor. Whats the best product to use for the patching, and fairing?