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Loctite PL300.  This is a construction adhesive so it's thicker, like caulking.  Very strong bond foam-to-foam and nicely strong from foam to many other materials.

If you need something thinner then I'd try Elmer's as Charlie said, otherwise PL300 is your best choice because it's made specifically for EPS foam (styrofoam).

Mike

Last edited by Mellow Hudson Mike

Hot Wire Foam Factory has a product called Foam Fusion that sets quickly and bonds permanently.  It looks like Elmer's glue but is not.  It creates a permanent bond, it's inexpensive at about $7 for a large bottle and you can cut through it with foam tools.  It also has a long shelf life.  I bought a bottle of it 2 years ago at Trainfest and I just used it a few weeks ago again.  I like it a lot.

I've used carpenter's glue in the past and that works good, too, but it is harder to cut with foam burning tools and harder to sand, too.

Mike

Thank you for all the replies.  I've gotten a lot of really good info in response.  For my current needs I think the Elmer's is the way to go but it's good to know about the Foam Fusion.  Past projects I've used the foam grade construction adhesives but never really had to cut or sand after bonding but I wouldn't think those adhesives would react well to sanding or heated cutting.

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