I added Quarrytone stone powder to my Foam-iT! 10 castable foam and the foam did not expand. What happened?

You cannot add powdered fillers to castable rigid or flexible foams. They are balanced systems that cannot have anything of substance introduced during mixing and pouring. Any filler will disturb that balance and the foam will not rise.

This FAQ article is offered as a guideline and offers possible solutions to problems encountered during mold making and casting. No warranty is implied and it is up to the end user to determine suitability for any specific application. Always refer to the provided Technical Bulletins (TB) & Safety Data Sheets (SDS) before using any material. A small scale test is suggested to determine suitability of any recommendation before trying on a larger scale for any application.