I bought one of those gel paste repair kits. It had several tubes of thickened gelcoat, catalyst, and tubes to help you color-match. For a small gouge like that, it would be perfect. I believe iBoats sells it. Evercoat Gecoat Repair Kit.
after doing a few hull restorations, I simply buy a quart of gel when needed. I have everything else at home. Gel has a shelf life of about 6-10 months.
The gel coat repair kit worked perfectly. It had more than enough to fill in all the gouges. The patch job isn’t perfect but it’s good enough. I’m not a talented body-man in hiding.