I may not understand what your ? is, but if you want to know what we use on gelcoat, I use Poliglow. They make a cleaner that you clean the hull with and then brush or roll the poliglow on. One bottle will let you put 3-4 coats on the first time and that will leave you about 1/2 the bottle left.
I think it's some of the best hull cleaner and protector.
Here's the web address
www.Poliglow.net
garage
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson