Help with a Gel Coat Repair Kit

[tsubaki]

Get the White, don't worry about tinting, the boat is probably stained.
After the final finish and cure of the repair, lightly water sand the general location then feathering (yet even lighter water sanding) beyond and then buff and wax. I'm sure you will end up with clean/bright patches where the repair is compared to the rest of the boat.
Or do like I normally do, fix the blemish, leave it alone till the urge arises to buff the whole boat (this ain't happened yet).