Here you can learn about what is needed to apply a Gel Coat.
1. Prep the area removing all of the damaged gel coat Keep the repair as small as possible. Prep the damaged area with 220 grit sand paper. Sand down any rough edges. A Dremel tool or die grinder can also be used to prep the damaged area. Cracks must be ground out prior to applying patch paste.
2. Begin by wiping the area clean with a acetone. Mix 10-12 drops of catalyst with 1 ounce(half a jar) of Spectrum Color factory color matched Patch Paste®. Fill the damaged area with the smooth drag. A second application may be necessary. After patch paste is cured, 1-2 hours sand and buff to finish.
3. Mark the repair area with a grease pencil. This prevents over sanding. Sand the patch with a 220 grit sand paper. Sand only as much as necessary to remove the excess material and or the grease pencil's color. Keep the block or sander flat to prevent a wavy patch. Repeat process with 400 and 600 grit paper.
4. Buff the area with a mild compound to remove the 600-800 grit scratches. Repeat until the area is free of sanding scratches. Do not burn or over buff the area. This can discolor or remove all of the gel. Polish to a deep shine with a wax or glaze.