Hi Sam,
It all depends on the base gel coat you’re tinting.
If you have access to Hobie’s blue gel coat, pour a portion of the base gel coat into a mixing cup and then mix in very small amounts of white tint to lighten it up and even smaller amounts of orange tint to dull and age it even more (pre-mix the standard red and yellow tint together prior to adding it to the base). A bit of black might help too.
If you start with a white based gel coat, do the same as above but first start out by gradually mixing in the blue tint and then proceed with the rest of the tints.
Make sure you color test the area that is being repaired as the deck will be more oxidized than the bottom.
Another option is to simply use sanding/finishing resin since it’s on the bottom of the boat anyway ("underside/blade" as you mentioned). Finishing resin is easier to acquire, has far less steps, and you’ll be out on the water sooner.
Good Luck,
-Dennis
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