PLAID-Mod Podge: One-Step Crackle Medium. Create aged and weathered effects on your projects with this crackle medium. Apply it over a Mod Podge’d surface and allow to dry. Once dry the crackling effect shows. Apply a topcoat of contrasting color then wipe it off– the color stays in the cracks only! This package contains one 2 fl.oz. bottle of Crackle Medium and one foam application brush.