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.
Repainting old concrete walls.
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.
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.
However some of the white oil based has peeled off also to reveal the.
Aged concrete surfaces are coated with various things such as staining compounds sealants and of course older paint all of which present difficulties.
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.
If you re painting indoor concrete you ll also want to apply a concrete sealant so moisture doesn t mess up your paint job.
The solution will remove the grease and oil which might prevent the new paint from sticking.
To prepare for repainting.
To paint concrete start by cleaning it with soap and water and repairing any cracks or uneven surfaces.
In other words don t paint.
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.
As a general step you must always observe the condition of the surface that needs repainting.
Clean the concrete walls with a trisodium phosphate solution and a scrub brush.
Use a scraper to remove the old paint from the wall.
By painting the walls or foundation you increase the appeal of the space but also it improves the moisture control from the wall.
Outdoors get rid of old paint with a power washer rents for 40 to 75 per day.
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.
Rinse the wall well and let dry for several days.
Use a masonry sealer such as thoroseal that also patches.
These are the steps for repainting your wall.
Wash the wall to remove any grease.
I have 67 feet of an exterior 40 year old cinder block wall on my property.
When you have a basement you will either have a concrete foundation or cinder block foundation.
Concrete is a porous material that can absorb water from the ground and transfer through the foundation.
From there you can take a specific course of action or treatment.