Question on using GS foam
Before I get to the point of starting of using GS foam, I have a question on water proofing.
If I spray this as a backdrop do I have to put a sealer or coating on this is paint an ok way to seal this? If an area is to have water near or on it is the process the same? What are the best sealers if I need to use one?
I had seen a person useing spray foam and adding coco fibers while it is "wet" is this a way that will work? Has anyone done this?
I want to cut a few caves in a hill I will make out of this should I do this or should I put something in here to make a cave like a film container?
I want to have spots to plant on the wall also do I need to treat the inside any way?