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How to install Futures fin boxes

I am about to begin glassing my board but I’m confused about the fin boxes and i was hoping you guys could help me out. I have the future fin boxes installed in the foam and i understand i have to put resin in the hole i routed out and set the fin boxes. i know before i put on the fiber glass I’m supposed to tape off the opening of the fin box and then begin laminating, but how am i going access the fin box after the hot coat, do i sand the hot coat down until the tapes gets sanded off with it?

Yes, the tape gets sanded off and opens the fin slot. You can see the futures boxes have a raised tab that creates a bump in the lamination. When sanded flush with the board it opens right up.