Bob Smith Industries (the epoxy guys), sells a product called Foam Cure, for EPP and EPO. I’ve seen it at Hobby Lobby with their epoxies.

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Lee Reep
NAR 55948

Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor
In the Paint Shop: Nothing! Too cold!
Launch-Ready: Farside-X, Maxi Honest John, Super Scamp