Although for a "Maximum bond" they say 24 hours, I have never had anything come apart after a few minutes and the bond is stronger than the surrounding EPP.
Yes, I'll agree Foam-Tac is more expensive, but I've used Welder's, Foam-Tac, E6000, Gorilla Clear, Quick Grip, Goop, BSI Foam Cure, and Jingiang JQ-2118 on EPP. They all work and have their benefits and drawbacks. Foam-Tac is what I use and recommend, even with the price.