For filling box sections on older cars to help combat corrosion - has the advantage that will expand to prevent further moisture coming in but will also reach places where a brush can't-- spandit, Aug 21 2006 Expanding foams are readily available, and in that they exclude moisture, they are anti-corrosive.-- ldischler, Aug 21 2006 Urethane foam could also trap moisture, but it should reduce condensation.-- jmvw, Aug 22 2006 If it were a chemical anti-rusting agent, it would prove very helpful. It shouldn't be too hard to produce, either. Brush on/spray on agents are widely available, as is expanding foam. Just mix the two.-- Hunter79764, Aug 22 2006 simply change one word and you get my vote.... "cars" becomes "teeth".-- xenzag, Aug 22 2006 Teeth, ha! They could pack old grandad in expanding PU just before they lowered him in the ground.-- ldischler, Aug 22 2006 Corrosive guy, granddad.-- jmvw, Aug 22 2006 It's not what [xenzag] suggested, but for some reason, on reading his anno, I got "anti-corrosive expanding teeth". Weird.-- david_scothern, Aug 22 2006 random, halfbakery