We have this debate every couple of years, and I believe I've learned from a previous discussion that there is more than just one type of "blue foam". One is polystyrene, and fuel will dissolve it quickly. I believe there is another type that will not, but it's more of an open cell stuff, maybe urethane, so you're right back where we started.
I have a small leak on my "main" (passenger) tank. If I fill it up to within about 1.5" of the top, I can smell fuel in the plane later. Needless to say, I don't fill it to within 2" any more, but if I had styrofoam wing skins, they'd have been flapping in the breeze a long time ago. and I'm pretty sure that tank would have no bottom in it now... Mark Langford N56ML "at" hiwaay.net website at http://www.N56ML.com --------------------------------------------------------
