I have a leak in my cabover. This weird white stuff showed up. I don't think it's organic, as it's as hard as a rock. I think it might be some expanding foam that got activated by the water.
I'm thinking it is not due to water and a reaction as we use spray foam to seal greenhouse spaces and it doesn't change when rained on if it is fully dried and cured. Uv and sunlight turns it brown but doesn't move or change it otherwise.
__________________
Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!