Mod Podge: 4oz All-In-One Glue/Sealer/Finish Non-Toxic - Matte.
Use on most surfaces. Apply with soft bristle brush or foam applicator. Cure time: 4 weeks. Apply Clear Acrylic Sealer over cure Mod Podge to eliminate tackiness. Soap and water cleanup. Can also be used as a puzzle sealer. Non-toxic.