Repainting Old Concrete Walls

As a general step you must always observe the condition of the surface that needs repainting.

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. 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. From there you can take a specific course of action or treatment. In other words don t paint.

When you have a basement you will either have a concrete foundation or cinder block foundation. To paint concrete start by cleaning it with soap and water and repairing any cracks or uneven surfaces. By painting the walls or foundation you increase the appeal of the space but also it improves the moisture control from the wall. Painting a concrete wall can spruce up an area or make it blend in with the rest of the area s décor.

If you re painting indoor concrete you ll also want to apply a concrete sealant so moisture doesn t mess up your paint job. Wash the wall to remove any grease. Use a scraper to remove the old paint from the wall. Once you re done with that apply a layer of concrete paint primer with a roller and let it dry.

These are the steps for repainting your wall. Outdoors get rid of old paint with a power washer rents for 40 to 75 per day. Repainting concrete surfaces is a bit more demanding than painting freshly laid concrete. 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.

To prepare for repainting. I have 67 feet of an exterior 40 year old cinder block wall on my property. Clean the concrete walls with a trisodium phosphate solution and a scrub brush. However there are some things to consider when painting a concrete wall.

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. The solution will remove the grease and oil which might prevent the new paint from sticking. However some of the white oil based has peeled off also to reveal the. 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.

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. Use a masonry sealer such as thoroseal that also patches.