With all respect, I must disagree. I built a Krick sub with Stabilit Express some 14 years ago, and it's as strong as ever. I've never seen it get soft, like some epoxys. It has a short shelf life once opened (don't buy the large size unless you're working on a big project!), but is a great product!
Also, I'm pretty sure our own Al Matava of Ships 'n Things carries it. (support our SubCommittee member vendors!)
Underwater, the ONLY way to fly!
SubCommittee member #0069 (since the dawn of time)