Painting concrete surfaces is different than coating a drywall. Not only does it take more time, skill and tools, but the preparation procedure is more complex. These steps should explain what it takes to paint concrete and how to do it.
Sometimes you need to paint the concrete surfaces in your house, for example in a laundry room, or if you are furnishing an entertainment room in your basement. The thing with concrete is that painting it is much trickier than painting other surfaces for many reasons. Concrete breathes, transports moisture and most importantly, it sucks up paint. In addition, unlike painting drywall surfaces, which can be finished in a day or two, painting concrete can take a week or longer.
The porous structure of a concrete surface often contains dirt, grease or oil, which means that it needs a thorough cleaning before painting. There are many concrete cleaning products, some of them are based on trisodium phosphate, and there are even some eco-friendly ones. If you need to paint an outdoor surface, be sure to rip off all the vines or moss growing on it. You can use a pressure hose to remove the remaining dirt and vegetation. Outdoor concrete surfaces sometimes may develop efflorescence. It is a white powder layer caused by water crystallization from salts to the atmosphere. Remove it with a concrete cleaner or phosphoric acid masonry cleaner.
Removing Old Paint
The old peeling or blistering coat of paint can be stripped with a wire brush and a paint scraper, with a generous amount of elbow grease, if the surface is indoors. Outdoor paint can be removed effectively using a power washer, which can be rented.