For oil based paint a medium grit sandpaper 100 to 150 grit should be used.
How to clean concrete walls before painting.
A soft brush vacuum cleaner hose attachment.
Slip on a face mask and safety eyewear to protect your respiratory system and eyes from any harsh dusty residue released into the air by the.
Remove dirt and grease with trisodium phosphate 6 30 per quart concentrate or choose a more earth friendly cleaner like krud kutter s pre paint cleaner 10 for 32 ounces.
Examine the walls.
Dust off the walls with a dry rag to remove loose dirt and dust.
Cleaning concrete is a vital first step because the porous surface tends to trap dirt grease and oil.
Things that you need to clean before going to the next step of the cleaning times you have to prepare some stuffs.
This will catch any drips from the cleaning solution.
Spray the wall as necessary.
A thorough cleaning with a concrete safe cleanser lightens stains and usually removes them completely.
Prepare to mop the concrete with a trisodium phosphate solution tsp.
I once tried cleaning a concrete garage.
1 spray the entire wall with water to rinse off dust and dirt.
Scrub the entire wall briskly with a dry stiff bristled scrub brush or a stiff wire brush.
The simple things that you can do in your exterior house 1.
How to prep walls for drylok.
Mop the tsp solution onto the entire concrete floor using a sponge mop.
Smoothing walls before painting is necessary for surfaces previously painted with a gloss or high gloss paint.
You can and should try applying common detergents directly to the tough spots and scrubbing with a bristle not wire brush.
Protect the floor around the walls with plastic sheeting.
Again wipe away any debris and allow to dry completely.
How to clean interior concrete walls step 1.
For previously painted water based paint sand with a fine grit sandpaper.
So how to deal with those stuffs.