I need to fill a couple openings in the frame and underbelly that were created when a new leveling system was installed n our Jayco last fall. The grey stuff Jayco uses looks like open cell but anyth...
But on the other hand normal polyurethane foam is water proof but maybe not resistant to direct impingement of flowing water like the waterfall foam. And a lot cheaper. However waterfalls in the RV belly are quite rare.
