Repainting Old Concrete Walls
Concrete is a porous material that can absorb water from the ground and transfer through the foundation.
Repainting old concrete walls. 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. Use a masonry sealer such as thoroseal that also patches. From there you can take a specific course of action or treatment. Repainting concrete surfaces is a bit more demanding than painting freshly laid concrete.
Painting a concrete wall can spruce up an area or make it blend in with the rest of the area s décor. However there are some things to consider when painting a concrete wall. Use a scraper to remove the old paint from the wall. I have 67 feet of an exterior 40 year old cinder block wall on my property.
Outdoors get rid of old paint with a power washer rents for 40 to 75 per day. Once you re done with that apply a layer of concrete paint primer with a roller and let it dry. Rinse the wall well and let dry for several days. If you re painting indoor concrete you ll also want to apply a concrete sealant so moisture doesn t mess up your paint job.
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. When you have a basement you will either have a concrete foundation or cinder block foundation. 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.
Aged concrete surfaces are coated with various things such as staining compounds sealants and of course older paint all of which present difficulties. Wash the wall to remove any grease. To paint concrete start by cleaning it with soap and water and repairing any cracks or uneven surfaces. The solution will remove the grease and oil which might prevent the new paint from sticking.
To prepare for repainting. In other words don t paint. 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. By painting the walls or foundation you increase the appeal of the space but also it improves the moisture control from the wall.
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. These are the steps for repainting your wall.