Smoothing walls before painting is necessary for surfaces previously painted with a gloss or high gloss paint.
How to clean concrete walls before painting.
The simple things that you can do in your exterior house 1.
Dust off the walls with a dry rag to remove loose dirt and dust.
For previously painted water based paint sand with a fine grit sandpaper.
Fill a bucket.
So how to deal with those stuffs.
For oil based paint a medium grit sandpaper 100 to 150 grit should be used.
Spray the wall as necessary.
Again wipe away any debris and allow to dry completely.
But you may not get far.
Examine the walls.
Things that you need to clean before going to the next step of the cleaning times you have to prepare some stuffs.
Mop the tsp solution onto the entire concrete floor using a sponge mop.
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.
1 spray the entire wall with water to rinse off dust and dirt.
How to clean concrete walls before painting.
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.
Protect the floor around the walls with plastic sheeting.
Scrub the entire wall briskly with a dry stiff bristled scrub brush or a stiff wire brush.
A soft brush vacuum cleaner hose attachment.
This will catch any drips from the cleaning solution.
I once tried cleaning a concrete garage.
Cleaning concrete is a vital first step because the porous surface tends to trap dirt grease and oil.
How to prep walls for drylok.
You can and should try applying common detergents directly to the tough spots and scrubbing with a bristle not wire brush.