How to prep a painted concrete floor for repainting?

Powerwash it first

Have you considered an acid stain? Concrete is very porous, pulling water through so Paint will peel and bubble, even with a top coat. Concrete Stain is permanantly etched onto the surface

Hello Bar,

I have the similar situation in the basement —a concrete painted laundry room floor painted several times over the decades two at least. I asked the expert’s at Rustoleum. Here as the response to my situation. They’re customer support and service is fabulous.

Hope this helps,

“That's a great question, as long as the paint is still properly adhered and not peeling, you can probably get away with several layers (see #13 of our FAQ's to learn how to check for proper adhesion tps://www.rustoleum.com/pages/homeowner/faqs/rocksolid-faqs?page=3). However, you're right, after a while you start to lose performance and adhesion properties. When you do decide to remove the paint, try our Rust-Oleum Paint Stripper https://www.rustoleum.com/product-catalog/consumer-brands/concrete-prep-and-accessories/rust-oleum-paint-stripper/. “

Clean real good with TSP (Walmart or Home Depot has it) then use gripper primer or Zinsen 123

let dry and paint concrete and floor paint over it

Usually concrete paint is it's own sealer. I wouldn't add another