Clean the concrete walls with a trisodium phosphate solution and a scrub brush.
Repainting old concrete walls.
Aged concrete surfaces are coated with various things such as staining compounds sealants and of course older paint all of which present difficulties.
Because concrete is porous it absorbs a lot of paint.
Use a scraper to remove the old paint from the wall.
Clean the concrete wall.
As a general step you must always observe the condition of the surface that needs repainting.
Choose paint for your project.
These are the steps for repainting your wall.
A suitable spray pattern is the 15 degree tip held 12 inches from the surface.
Repainting concrete surfaces is a bit more demanding than painting freshly laid concrete.
Wash the wall to remove any grease.
Use a commercial style pressure washer and at least 2500 psi.
Unless you re an experienced painter you may want to purchase extra paint to account for more absorption than usual.
Sand and prime the filled areas priming will seal the filler and keep it in place.
Surface preparation for old painted walls is a little different from new concrete because previously painted concrete surfaces can have an existing problem that needs to be treated first.
You might want to sand and reprime.
The solution will remove the grease and oil which might prevent the new paint from sticking.
You can actually increase the amount of livable space you have just by adding some paint.
Any remaining loose paint will need to be removed manually.
Repair any cracks or blemishes in your wall with concrete patch.
To prepare for repainting.
For exterior projects use a power washer to rid the wall of all dirt and dust.
The first step when preparing concrete block walls is pressure washing.
From there you can take a specific course of action or treatment.
You will need a paint that is.
Painting interior concrete walls can add warmth to a basement at very little cost.
Fill any holes and cracks with suitable filler perhaps using flexible filler for cracks.
Continue reading below our video of the day.
A space that may once have been dank and dirty can now be bright and clean.