Navigation

previously stained concrete

by Christine

Q.This is a great site but I couldn't find this answer anywhere. We previously stained out concrete patio with Behr stain. I can't remember if it was semi-transparent or a solid stain. It is a very light tan color. Although we did follow all of the steps on the can including cleaning and priming, the stain has worn off. I began to wear off only a few months after the application. We would like to redo it or somehow make it look better. I really like the idea of scoring lines so maybe we can do that and then restain. What do you suggest? And do I have to remove the old stain or just sand it down? Or clean it? Please help. Thank you.

A. When stain wears off that quickly it's usually for one of two reasons. Either the pores aren't opened enough to accept the stain or the concrete was acidic preventing a good bond. If it's wearing off then I would definitely suggest stripping the old stain first. This can be done by either grinding it off or using chemical strippers. I would suggest calling the Behr company and asking for the best product to strip their stain. They may even give you new stain since the first application failed.

Before restaining you should acid etch with diluted muriatic acid to ensure the pores are opened up. Just make sure you neutralize with ammonia or baking soda. Nothing will stay on the concrete if it's acidic.

I would also suggest applying a clear coat of concrete sealer on top of the stain to serve as the sacrificial coat.