I am sure most of us on here have glued pieces of styrofoam together. There are dozens of different agents out there that we have used with different levels of success. I have never been able to find one that works every time. What seems to work on Monday will not work on Tuesday! Last night I noticed a tombstone coming apart and was going to need to be glued together. I took the tombstone back to the workshop and looked through my assortment of glues and decided that the only thing I can ever get to stick to the styrofoam every time was paint. So, I applied a pretty heavy coat of exterior paint to both pieces of styrofoam and clamped them together and lewet them sit overnight. I was amazed and how well these 2 pieces of foam are stuck together! How long it will last.....who knows! But it was simple and it seems to have worked!