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How deep do the holes need to be for the fin plug set? How much do I fill the holes with my resin mixture?
Drill the hole 1/2" deep to install the FCS / FACTORY fin plugs.
Fill the hole about 1/3rd with resin and set the plugs in. Secure a fin or dummy fin in the plugs to set the correct spacing and cant angle.
Tape the top of the fin to prevent the plugs from floating and have a reference to set the cant angle while the resin cures.
About an hour later come back an fill the rest of the hole with resin. Overfill a bit as the resin will drain deeper into the foam.
It's best us use a 4 oz. resin mixing cup and pinch the top to make a pour spout to get the resin right in the space between the plug and hole.