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taping off the surround area so you get good clean up in near impossible as the tape only sticks to the peaks and the gelcoat leaks in the valleys, the amount of gelcoat you use has to be near exact or you end up with voids or a hugh mess and last matching the gelcoat that is weathered is very diffucult. I will admit that they can do a fair job on a new boat with a small divot in the nonskid but large areas never seem to come out very good.
Bill
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Taping does only really stick to the tops of the non skid pattern, but the wax that you apply before you router out the area prevents the gelcoat from sticking in the valleys.
With practice, it is possible to make an almost invisible repair, though you are correct that the color matching is a pita, even with aged gel matched to a color chip from the orgional boat.There is always a slight color difference.