Stamperia - Jumbo Crackle - Step 2 - 150ml. Jumbo Crackle creates deep, dramatic crack effects with a simple two-step application. Apply Jumbo Crackle Transparent Step 1 (K3P77) first in this two-step system, once it is completely dry, apply Jumbo Crackle Step 2 (K3P78). The thicker the product layer, the larger the resulting cracks. Speed up the drying process with a heat gun, but natural drying is recommended for best results.