Thanks for the clarification Wayne. I trust your opinion as I know that you are a surveyor
Since the OP wants to "repair the gelcoat on the Nico" (his boat's name no doubt) wouldn't he be better advised to use a fresh can (or two) of an actual vinyl based gel-coat rather then a vinyl-ester putty?
I suppose it would be helpful to know the extent of the repairs
the owner of the 'Nico' was intending to do and what sort of damage exists that needs to be repaired: crazing, chips, scrapes, dings or a more extensive repair. Pictures would make it easier to size up the extent of the damage I suppose.
As you have noted in other threads it is not recommended to use vinyl based gel-coat over an epoxy
repaired section. Knowing the full extent of the repair would dictate what actions might be recommended.
What do you think about using Marine-Tex (epoxy based putty) to fudge a repair to small gel-coat damage (dings, chips, scrapes etc.)? I expect you will suggest that using a vinyl based gel-coat (as long as no epoxy
repair has been done) is preferable as it is more easily faired then Marine-Tex.
And so, on to gel-coat repairs
Once a scratch or chip has been adequately faired out I thought that prior to applying your freshly mixed gel-coat it was recommended to wipe the area with acetone which can partially activate the old gel-coat and help create a better bond for the repair.
Or does wiping the repair area with acetone merely get rid of oils which makes for a cleaner repair?