We had a deep (black) chip in our tub caused by someone dropping a wrench on it. Additionally, because our tub is metal, it was extremely slippery and I continually feared that I might fall while showering. I reviewed several companies before choosing Dr. Tubs and ultimately chose them. The technician (Gerald) arrived at our home and set up his equipment. I was told beforehand that a large hose needed to be placed out a window that opens at least 8 inches. My bathroom window does not open that wide, but Gerald was able to place the hose out a wider window in another room because the hose extends approximately 30 feet. Gerald was extremely polite and efficient. He covered the wall tile, faucet on the tub and floor area where he was working in order to protect them. The entire process took approximately 4 hours and there is a slight odor for the first day or so which dissipated by leaving the bathroom window open during that time. You cannot use your tub for the first 24 hours (the glaze has to dry completely), but I waited a full 48 hours before using that tub/shower. To my delight, the tub is no longer slippery and the chip is no longer visible. Gerald did a great job and cleaned everything up after he was finished. Although it has only been 1 week, I am pleased with the results.