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Peter -

My keel rash was ~6 inches long and as deep as 1". For the thick areas I did two layers with several days between applications. The area repaired has held up with dozens of launches and retrieves and no sign of a problem.

You may want to read a bit about Marine tex:

http://www.marinetex.com/marinetexepo...putty.html

It comes in two containers and you mix them together. Since I am not great at getting precise measurements, I mix up the entire batch (small size box) and do several repairs at once.

I decided against the gelcoat patch kit from Spectrum for several reasons:

- Spectrum custom colors don't always a match.
- The repair was on the keel and no one would see it so color was not important.
-Spectrum products are not sold in local stores in custom colors so advanced planning is required (not always possible).
-Marine tex does not require gelcoat and can be left as-is.

I have used Spectrum's patch kit on filling holes in the console and RPS and it works too.

My advice is from personal use and following what dozens of members have done.