What Are The Prerequisites of Painting A Cemented Wall?
Painting a cemented wall can tidy up an area and make it merge in with the rest of the area’s décor. However, there are certain points to consider while painting a cemented wall. Use the following tips before splashing colors on that piece of concrete.
Choose the Appropriate Paint
Select paint suitable for your project. You will need a paint that is resilient to dampness and sun damage. For outdoor projects, there are several outdoor concrete paints available. However, an oil-based paint may also suffice your needs. The indoor paints should also be chosen carefully. Basement concrete paint or interior acrylic paint can be used.
Clear the Room
We all know that paint drips downwards, so anything that lies underneath what you are painting needs to be moved to another room or covered. Also make sure that you avoid splattering paint sideways while swinging your tools or painting too aggressively.
Clean the Wall
The walls must be completely dry and clean of dust. If the existing paint on the wall is chipping, it will need to be scraped out. If not done, your new paint will soon start to flake off. A power washer can be used for exterior cemented walls to get rid of all dirt and dust. For interior walls, you can scrub the wall with soapy water and a scrub brush. All the unwanted lumps and protrusions like nails, hinges etc., should also be removed.
Repair the Cracks, if any
Any cracks and holes in the wall should be filled. The filler should be a material which can endure hostile effects of weather. A trowel can be used to even out the patches to match the surface of the wall. Self-expanding sealing foam should be used for filling larger holes. For small holes, wood putty, joint compound or spackle should be used. The bumps and ridges can be removed by scrapping the wall with sand papers.
Check the Wall for Moisture and Grease
Paint applied to a poorly-sealed wall will not adhere properly. The wall should be taped with plastic sheeting, which should be as air-tight as possible. Do a check after 24 hours. If the plastic shows moisture, the wall will need to be sealed. If no moisture is present, this means that the wall has been sealed properly. A household detergent or a light acid (Trisodium phosphate) can be used for breaking down grease and oil on walls. Some moulds can be very dangerous. In case you have any, a mix of bleach and water (50% of each), can be used to remove it. Be sure the room is kept dry enough to prevent future mold growth.
Apply Concrete Primer
Majority of paint manufacturers suggest that the proper primer should be applied to new or relatively new cemented wall, to achieve the preferred bond, and evade probable delamination of paint. It is also recommend that certain primers and paints should be used in combination with each other.
Paint the Cemented Wall
Before starting, read the paint can carefully so that you know how long will it take for the paint to dry. At least three thin coats of paint should be applied, allowing it to dry between coats. The paint can either be painted on with a brush, sprayed on or rolled on. The paint should show brush strokes or be streaky. A concrete paint sealer should be used to help the paint to adhere to the wall and last longer.
When your painting session is over, pack and keep your tools safe. If you just keep them lying around, they will dry out and become useless.
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