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Garris - Fill any screw holes etc located within the transom well with patch paste and let harden. Then sand smooth. Mask the area you want to cover and then spray 2 successive coats without surfacing wax. Add surfacing wax to the 3rd coat. You have about 10-15min before the gel coat hardens for each coat (the more hardener the less time, the less hardener the more time, etc). Once the final coat has hardened for 24-48hrs start wet sanding as described on my project page. Alternatively you can mask a larger area and then feather the edges. If the gelcoat match is good you can skip feathering. Also when spraying the area in my project page I filled the entire canister on the preval sprayer and almost emptied it for each coat. If your area is smaller you can use proportionately less. The idea is to build up enough thickness so you have enough material to work with as you sand it down smooth and then buff/wax.

For screw holes located elsewhere on the hull I would consider using color matched patch paste. Use masking tape to mask a small circular area around each hole. Fill with patch past using a putty knife, cover with wax paper, and let cure. Remove the masking tape/wax paper and then sand with wet sand paper gradating upward from 220 to 400, to 800, to 1000, then buffing compound, and then wax.