There are 2 ways to go:
1. Go to your local marine supply store and get a gelcoat repair kit. It will come with several colors and you can mix yourself to match as closely as possible.
2. Go to www.spectrumcolor.com
and order the exact color for your boat. They have gelcoat colors based on your boat manufacturer. Be sure to call your boat manufacturer first and get the actual gelcoat colors from your Hull ID#. I thought my boat was black and white, but it was actually black and really light grey.
Just fill in the holes with the gelcoat paste, let it dry, then sand and buff. Then send me the $400 you saved.