Trailer rash repair
 

Looking for advice on how deep to sand down the keel to repair some trailer/beaching rash. The boat is a 1986 18. I plan on using epoxy and 12oz biaxle for the repair. I don’t see any cracks but it also isn’t exactly clean glass... I’m hesitant to grind any further but I also want my repair to bond correctly. Any advice would be super appreciated. Pictures below. Thanks

It's hard to tell how deep it's been ground down in the pics but I'll put in my 2 cents. On mine the previous owner used a light glass with polyester resin. I was able to actually peel the whole thing off by hand because they didn't even sand the gelcoat. After grinding it a bit I thickened some epoxy with fumed silica and 1" strand of loose glass. I spread it over the affected area and let it cure before sanding it to shape. In the past I tried patch smallish gouges with cloth but found myself sanding most of it off trying to make it look good. I'm guessing you don't have access to the inside but if you did, I would suggest adding the cloth there.

3-M has several glass repair systems sold at West Marine.
I like the Fasco line products. The Fas-Stone 2 part Epoxy is very easy to use.. mix is 50/50 and easy to apply. Dries in a few hours.. sand the next day starting with 180-150 grit then down to 800. Great for small dings and scrapes also. White in color. I'm sure Dirt Wheels will have other solutions.

That really does not look like you need to add any fiberglass cloth. There are lots of polyester fillers that come with glass mixed in them...spred, sand, gel coat and be done...or you can make your own as mentioned above...epoxy is ok as well like the stuff Capt Chuck showed if you want to do a one step process but the color may not match exactly.

strick

Maybe just some chopped strand to make sure those long linear “fractures” dont come back thru the finish... squirt some gelcoat and knock it down then buff away.

Thanks for all the advice. Went with 1208 and a layer of csm. Came out pretty good