Originally Posted by sww914
This is a normal repair for a car. Virtually all automotive paints are repairable and most are blendable.
Check some autobody forums to learn more about these types of repairs, but here are the basics.
Clean the entire area with wax, grease, and silicone remover.
Sand down the gouge with 80 grit, keep it feathered out.
Fill the gouge.
Sand down the repair with 40 and then 80 keeping all your scratches in a small area.
Sand the entire abraded area with 150 and then sand a couple inches farther out with 320.
Prime over all of the 80/150 scratches keeping ALL of the primer inside the area of the 320 scratches.
Sand the primer and the 320 scratches with 400 wet.
Sand 6-8" around the 400 with 1000.
Clean again with wax and grease remover.
Paint, keeping all of the paint inside of the 1000 grit scratches. When you paint, put the first coat covering just the primered area, the second an inch farther out, the third another inch farther out, tapering the edges on each coat.
Let the paint dry for 24 hours.
If it's really rough sand first with 1000, then 1200, then 1500 and polish.
Any decent autobody store will have a dupont camera that they can bring out to your boat and take a picture of the paint and the computer will match it for you.
You'll be doing all of your shopping at the autobody store here, the boat stores won't have all of what you need.
Not all yacht paints used to refinish GRP hulls can be overpainted with auto paint. Yes many can but not all. ASK ME HOW I KNOW THIS.
Get some of the paint you plan to use, paint a little on in an unobtrusive area and cover it with clear film to slow the solvent evaporation. This will show up incompatabilities.