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I'm going to use black G10 for fins on a small rocket. Plan is to leave them black and not paint them, saving time, work, weight, thickness, etc. BSI 30-minute epoxy to attach the G10 to the cardboard. Because I won't run the BT finish color all the way up the fillet, there's potential for a gap alongside the fin, in the fillet, where the BT color shows through. I'm thinking just Sharpie the BT black around the fins so the fillet is clear epoxy over black G10 and black BT. Should look fine.
Any chance of the Sharpie black leaving something in the cardboard that limits adhesion or affects curing of the epoxy? Obviously, I'll wait a few hours at least so all the solvents evaporate.
Any chance of the Sharpie black leaving something in the cardboard that limits adhesion or affects curing of the epoxy? Obviously, I'll wait a few hours at least so all the solvents evaporate.