I painted my basement floor and now just 3 weeks later my washer leaks and the paint is peeling off. I also put some water down on a spot and when I wiped it up you can scratch the paint off. It is durable when dry but as soon as it gets wet it comes off. Why and what can I possibly do now?
First it sounds like you used a latex paint which for a basement floor is not a good solution. You need to use the messier, oil based paint. This will soak into the concrete a bit and are a lot more durable. This paint will continue to have problems when wet - especially with hot water or when scraped by something sharp or heavy.
Also at the 3 week period I doubt your paint has fully cured in a basement environment. Once it cures it will hold better but probably not up to your expectations.
It will say on the can of paint what the cure time is. The concrete has to be cured about 30 days to apply concrete paint. But the room also has to be dryer than a normal basement. I would run a dehumidifier for a week or so before you paint or if you have heat in the basement turn it on. Some concrete paints need to have a primer/sealer put down if it hasn't been painted before. I have done this on 1 year old concrete with great success-no peeling even with occasional puddles and one flood. I would us a high quality paint-research Consumer Reports to find the best ones.
The two key steps in painting cured concrete are proper surface prep; etching, and using the correct paint. Etching opens pores in the concrete providing something to bond to and removes the alkali salts that will prevent good adhesion. How do I prep my houses exterior cement walls for painting?
We have the same problem for several years now on screened porch, patio and front entry way which is a covered porch area. The water based paints do fine as long as not used walked on or get wet but we live here! It gets dirty and you try to wash it the paint comes up and you get to start all over again.
Am going to an oil based paint said to be for concrete to see how it works. It only makes sense to me that if cleanup is warm soapy water water will take it up.