Porter's Crackle Medium is an easy to use medium for creating antique and decorative crackle effects on furniture, walls, picture frames and other decorative elements. Inspired by the time worn charm of provincial antique furniture and artifacts, Crackle Medium marks any painted surface with the gentle hand of age. This product contains 155g/L VOC. The APAS target level for this product is 450g/L. (APAS is the Australian Paint Approval Scheme).