Use a masonry or concrete sealant to seal the wall.
How to seal painted concrete wall.
Attach a long arm to a roller brush and begin working the sealant onto the painted concrete floor.
Using a 1 inch nap roller or handheld airless paint sprayer evenly spread a thick coat of the stripper onto the concrete.
Paint a generous coating of this material onto the wall working the product in all directions to completely seal any pinholes.
Be sure to start at one side of the room and work toward the door to avoid painting yourself into.
You ll paint this sealant onto the concrete in long even strokes.
Get as much ventilation in the room as possible.
You may need to wait several days.
Product times vary so read the manufacturer s directions to determine how long the stripper should be on the concrete before removing.
Get complete coverage and make sure your sealer is completely dry before moving on to the next step.
Peel off the foil after 24 hours and.
Simple 5 step guide to concrete painting.