Hello Chris, thank you for your question, the RYOBI Contour Metal Buffing Kit (5-Piece) is meant to be used on metals, we cannot recommend it for your counter tops.
Great question Jr1000kw! The RYOBI Contour Metal Buffing Kit (5-Piece) Emery (black) Compound helps clean hard metals, the Tripoli (red/brown)vCompound helps clean soft metals and plastics, and the White Rouge Compound is used for final shining plastic and almost all metals except solid and plated silver/gold. Thanks for your interest in the Ryobi Brand! - Eve
Hi aLLeViated, This is designed for use with a drill that has an adjustable chuck. Thanks for asking. Greg
Hi db, You apply the compound to the buffer as it is turning and use just a light amount of compound. Thanks for asking. Greg
Hi JPK, For issues with the tools and accessories you will need to call out customer service for help. 800-525-2579. Thanks for asking. Greg
windex would work on a mirror
I use the the buffer to do my polished wheels on my car. If the company can make a smaller wheel, it would be nice for smaller crevices.