I just fiber glassed a hole in my boat. Do they make a sealer or primer for fiber glass. I called boat US and they wanted to sell me a quart of 30 plus dollar primer. I don't want to spend that much if I don't have to.
Get gelcoat. Call some fiberglass places. Some places will match color. The smallest I've seen it come in is a quart. I went to Eastpointe Fiberglass on 9 mile & Kelly. The guy is real nice and is knowledgeable. I got white gelcoat, and a little bottle of badge tint and matched it myself because he does not match colors. Good luck