Primer to use with all the cracking systems including varnishes, pastes and the gel. Apply in an even layer and let it air dry. After it becomes completely transparent, apply paste. First apply a thin and even layer of the Cracking Primer and allow to dry. Once dry add the Crackle Paste using a sponge, brush or spatula this can also be applied through stencils. Non toxic. Certified by EN 71 & CE.