After removing loose or badly rotted wood, brush the Rotted Wood Restorer onto the damaged area and within 2 hours the damage can be filled with Bondo Wood Filler. The product is water resistant and is both paintable and stainable. A built-in brush applicator is attached to the lid for easy and convenient application. Because the product penetrates into the wood, it is able to create a solid base from within. Many products simply coat the exterior of the surface, but Bondo Rotted Wood Restorer penetrates beyond the surface. In only 2 hours, the product will dry to a tack-free finish that can be filled with Bondo Wood Filler to complete same day rot repairs. Bondo Rotted Wood Restorer is a one-part formula, meaning it does not require mixing. Simply brush onto the damaged surface and wait for it to dry to a solid surface.