Fiberglassing fins +/- expanding foam

Zyzzyva1000

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So just curious on opinions. I just finished 2 layers of 6 oz fiberglass on 1/8 plywood fins (debating a third layer). Once I have them attached had been recommended to do a tip to tip layup.

Long ago I used PMLs expanding foam to strengthen my fin cans. Was debating that here instead of the tip to tip fiberglass (in part because I think it will be messier, whereas what I have done so far looks nice). Any thoughts on these 2 option for adding some strength around the fins? (Hyperloc 300 is the rocket).
 
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