Question: Hi. I often read your articles in APC magazine and enjoy your simple, down to earth explanation of things. I often feel as confused today about which product to use as I did many years ago as a helper.
My question is: I am re-painting an exterior concrete patio and am not sure how to prep it. It is basically an extension of the sidewalk that lays in front of an apartment. There is patio furniture on it which will remain after the new coating. I don’t know the current coating on there but it is peeling bad with the concrete substrate exposed. Obviously I am going to scrape loose paint but not sure what else to prep with. Primer? This is not new concrete. I have a one part urethane based top coat for ext. Concrete. Thanks for your help.
Thanks for your comments and question.
I know the condition you are describing. And often, customers are not ready for a full on strip and refinish. It is more of a maintenance situation until the point of catastrophic failure.
Usually, if the existing finish isn’t obnoxiously peeling and failing, it is possible to scrape the loose stuff, then use a wire brush or even a wire wheel attachment on a dril (or a grinder) to get the stuff that hasn’t started peeling yet. Vacuum thoroughly, the dust is fine and the surface is rough, a bad combo. Depending on the amount of bare surface exposed, you might consider doing a concrete cleaner or a quick etch. Every situation is different, but these are some practical and effective options. Also, consider using one of those sand texture additives for traction.
Good luck with the project, let us know if you have other questions and keep us posted on your experience.