I typically use KILLZ products but saw this & thoughtI’d try it instead. It’s super easy to use on the ceiling because it shoots straight up. I had a pretty bad water stain from leaky plumbing in the bathroom above. I didn’t even have to get out my ladder. This completely covered it & dried to a matte finish that blended perfectly with my ceiling paint. It was covered at 1 coat but I gave it 2 more to blend out the edges & be completely unnoticeable. You can not tell where I covered the stain, not even in different lighting situations. It DOES leave a white dusting on adjacent surfaces below but it’s such teeny tiny particles that can be wiped off. It doesn’t actually leave paint that you have to scrape off or use some sort of of solvent to remove.I got everything cleaned off with just a microfiber dusting hand mitt I also got on Amazon.I have plenty left in the can after covering the stain but I purchased a second can to have on hand bc I like this product so much. If u have a gross water stain on your ceiling, this is the ONE!