Answer
May 25, 2021 - 04:16 PM
The product only works on concrete - for more information visit - Gray-Out Waterless Oil Remover - Sits Over Oil Spills and Stains Pulling the Oil Out of The Concrete - SealGreen Video on how to apply the product - https://youtu.be/i4Kmf48P-F0
Source: Gray-Out Product Page