@Gilly@N&W posted:Great Stuff shrinks. Make sure to give it plenty of time to set up.
Some of the Fort Pitt modular display is foam build-up. Over time, heat, storage, etc. does effect the foam. Modules have shrunk, and in some cases warped. Rebuilds/repair usually involved some type of wood base and attachment with foam safe construction adhesive. Encapsulate the foam with plaster/plaster of paris, drywall compound, or some of the plaster cloth products available.