Some exotic woods contain tannin. Tanin is a natural extractive which reacts with water and leaves stain or overall darkness on the wood after the water evaporates. These types of woods therefore need specific protection to prevent tanins from migrating to the surface of the wood. Guard Industrie has just developped WoodGuard Bloqueur de Tanin, a primer designed to block tannin. WoodGuard Bloqueur de Tanin can be applied to all types of woods which contain tanins (claddings, parquet floors, terraces, garden furniture...).