Our Raft Repair Abrasive Wheels work in any variable speed drill. Use them to buff the surface of inflatable boats. Most adhesives, paints and coatings will not stick to an inflatable boat unless the surface has been abraded to eliminate the shine. Always use caution to not abrade so much that you expose the base cloth. Choose our gray wheels for a more aggressive level of performance. Our orange wheels are less aggressive and better suited for older or thinner boats. We sell them in 3″ or 4″ with the smaller diameter being slightly stiffer and more aggressive. As a result, you can choose from four levels of performance. For instance our 3″ gray is the most aggressive while our 4″ orange is the least.