LOVE this product! Had a piece of furniture that was painted BLACK and my daughter wanted it to be LIGHT BLUE! I was thinking I would be there forever trying to cover the black or sanding the black off! Boy was I wrong this product is amazing! I started with 1 coat on it and was thinking how much it covered, you could see a very light streak of black in a few spots but not black showing through. I did 1 coat and waited till the next day, I started putting a second coat on the top and ran out of it, I figured I was going to try a inconspicuous place and see how it looked. I did a bottom piece and put one coat on of the blue. I waited a few hours and went to look and it was all covered. I did a single coat on the entire thing and it looked great there was NO black showing through. I did put a second coat of the blue on to make sure it was all covered, but there was no need for a second coat of the KILZ! One coat covered the black paint. I would highly recommend this to anyone that is changing a color! I went from the darkest color to LIGHT blue and only need to coat it 1 time. I could have gotten away with one coat of the blue had I realized it was going to work, but I did a thinner layer convinced I was going to have to do AT LEAST 2 coats of it.