warwickl said..
I do not think this is the way it's done there days.
Do a search and you will find tracks prefixed into a high density foam block.
RAL INN,
I knew about the high density foam block but I have done two boards using something like your method.
When I did it the hole for my 12' fin boxes was snug. Yours looks like it is too deep, maybe right through to the deck?
I taped around the area to limit the area the resin covered. Sand the fin boxes and the bottom inside the tape.
Also I filled
inside the fin boxes with cut styrofoam then taped the opening to keep the resin out.
I part filled with epoxy then pressed in track with fibreglass wrapping it and overlapping.
(If I was doing yours and the holes were too deep I would add cut styrofoam pieces to the hole.)
I used chopped strand matt instead of woven mesh. Rougher finish but this matt seemed easier to make into the required shapes.
