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Craft supply stores, artist supply stores (and some office supply stores) carry various thicknesses of cardboard, poster board and foam core, many types of glues and adhesives in bottles, tubes and spray cans, and a big assortment of applicators from rollers to squeegees.
You should be able to find material of the thickness and stiffness that you need.
I have used both thick poster board and foam core to make the internal formers for models.
You can cut thick materials with a fine tooth jig saw or jewelers saw or use a utility knife if there are no tight curves and you are very careful about where you put your fingers.
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