Setting Fin Boxes with Epoxy?

Any hints for setting Futures? Using #2 EPS - should I seal the sides and bottoms of the routed hole with spackle? Using epoxy resin - will it get hot? Hope it doesn’t get as hot as it does when you leave some in a measure cup! Man, it gets hot! Any other hints?

Make sure that you route the opening as close to correct size. My first time I just roughed out it by hand and I thought the board was going to catch fire.

use slow resin (RR?), and put some pigment in it…that always slows it down…

small hole is the general rule…

cooling ambient temps, but stay in the range that the manufacturer recommends…

put water soaked rags under the holes on the deck side to absorb any excess heat…

you don’t need to seal the hole, but warming the resin in the microwave, then adding some microbubbles can help slow down the resin migration into the foam…not too much or it won’t flow out and fill the hole right… (personally, I don’t do this, but it makes sense to me…)

extra patches of cloth over the hole area before you cut out the hole on both the deck and bottom sides give the whole fin box more structural integrity, and helps reduce any expansion of the deck/bottom glass due to exotherm… Do it before you hot coat…

220,

I would seal the foam in the fin box hole w/spackle or epoxy resin w/microballons to prevent the the resin from draining. Use slow hardner. Make sure you have a sharpe router bit when cutting out the box area. (If it’s a dull bit it will get the wood hot and melt the foam around the stringer).

Paul