Foam-Tac is a popular and famous foam-safe contact cement that is designed specifically for foam, manufactured by Beacon Adhesives in New York. But its fairly expensive…
“Foam and Posterboard” Adhesive is also manufactured by Beacon – and it is very similar to Foam-Tac in many ways but its much less expensive! Its a lot thinner than Foam-Tac and takes longer to dry. It can get into cracks and tight spaces. Just like Foam-tac, its extremely effective on all kinds of foam. Its a great product for construction and a great addition to your toolbox.
It is waterproof, dries clear, and remains slightly flexible. (Not as flexible as Foam-Tac) It can be used on balsa and carbon-fiber as well as foam and has many other uses as well.