Repainting Old Concrete Walls

To paint concrete start by cleaning it with soap and water and repairing any cracks or uneven surfaces.
Repainting old concrete walls. I have 67 feet of an exterior 40 year old cinder block wall on my property. Repainting concrete surfaces is a bit more demanding than painting freshly laid concrete. As a general step you must always observe the condition of the surface that needs repainting. When you have a basement you will either have a concrete foundation or cinder block foundation.
Wash the wall to remove any grease. If you re painting a concrete floor remember to start on the far side of the room so you end up finishing near a doorway or another convenient stepping off point. Use a masonry sealer such as thoroseal that also patches. Clean the concrete walls with a trisodium phosphate solution and a scrub brush.
Once you re done with that apply a layer of concrete paint primer with a roller and let it dry. Outdoors get rid of old paint with a power washer rents for 40 to 75 per day. The solution will remove the grease and oil which might prevent the new paint from sticking. From there you can take a specific course of action or treatment.
If you re painting indoor concrete you ll also want to apply a concrete sealant so moisture doesn t mess up your paint job. Painting a concrete wall can spruce up an area or make it blend in with the rest of the area s décor. Water moves easily through porous concrete so sealing interior walls is necessary to prevent moisture from seeping in promoting mold growth and that cold damp basement feel. In other words don t paint.
You must choose the appropriate type of concrete paint determine if the wall is sealed from moisture and apply primer prior to painting the wall. To prepare for repainting. Rinse the wall well and let dry for several days. 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.
If you re painting over a wall with a paint that is close to the previous color then in general you don t need to prime existing paint. However some of the white oil based has peeled off also to reveal the. However there are some things to consider when painting a concrete wall. By painting the walls or foundation you increase the appeal of the space but also it improves the moisture control from the wall.
Use a scraper to remove the old paint from the wall. It has concrete stain oil based paint then acrylic paint in that order i am assuming the last paint was acrylic because that is most of what is peeling away from the white oil based underneath.