Thanks Kent for the paint thinner suggestion...I'll give it a try, but I think the stained seat will require something more aggressive. Fyi Bob...I too, as did Kent, found after running a long wire up the aft end of the mast, that some foam product still remains (one week later) sticky . As directed, I shook the 2 cans vigorously, so my only guess is that it requires open air exposure (not sure that makes any sense) to set firm. I will plug the bottom before stepping with hopes of avoiding Kent's problem. As far as I can tell there has been no significant weight change. I too would like to know if anyone has experienced positive mast foaming results.