This glue is not suitable for polystyrene. I have tried it on Dollar Tree Foam Board, Flite Test Foam Board and Class B Model Plane Foam Board and this adhesive will not stick to those surfaces! It just holds paper together, hardens for hours, is heavy and leaves marks. This product is similar to sticky cornstarch, although I think cornstarch foams better than this product. These positive reviews must be fake, since this material is inferior to Elmer's foam glue.
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