051003 ( 3167860510036 ) - 2x45ml Create an antique, weathered looking crackling effect to your painted glass, using this easy to use kit from Vitrail. Use on glass pre-painted with Pebeo Vitrail colours only (colours sold separately). Allow the Vitrail glass paint to dry for 1 to 2 hours before using the Crackle Medium, then apply an even coat of the Crackle Medium Step 1, using a soft brush. The crackle effect will start to appear within 15 minutes. Allow to dry for 24 hours and then apply the Crackle Medium Step 2, as with the Step 1. This protects the crackle effect. Set includes 1 x 45ml Step 1 Crackle Medium, 1 x 45ml Step 2 Crackle Medium and 1 x Instruction Leaflet.