We used this to remove a cracked hard shell (thick plastic similar to Corian) from our van. We made a guide out of straight 2x4 material. Uses a 2 1/4 HP cutter set at 12,500 RPM. Amana recommends 2 1/2 hp, but ours did the job. It took a while to work out the 1-inch lip on the sink, but I think that was mainly due to HP's low router. Very happy with the results.