Mod Podge is a popular brand of craft glue, which is manufactured by PLAID. It comes in a variety of variations as matt among others, silky and shiny.
Mod Podge has been around since 1967. It dries quickly, is water-based and can be easily applied with a brush, which is then washed with soap and water. Depending on the Podge is used, resulting in a matte or glossy surface. And - most importantly - Mod Podge is nontoxic.