After you have prepared the area it s time to choose your sandpaper.
Sanding concrete close to a wall.
Sanding concrete using an orbital sander if you have concrete that is going to be exposed architecturally you can sand it by hand using wet and dry sandpaper or an orbital sander.
Remove the soap residue by rinsing the walls with a sponge and.
Remove uneven patched areas of concrete by sanding it with an angle grinder.
Wash the walls with dishwashing soap and water.
Do not try to make the wall level.
Usually the patched areas are visibly noticeable even if the area gets painted.
How to smooth a concrete wall finish step 1.
A diamond pad is the only type strong enough to cut through.
Normally you d start by using a coarse grit sandpaper that is in the range of 40 60 grit.
4 thoroughly sand the concrete.
Also like sanding a concrete floor it is best to start with an area in a corner or near a wall.
Once your mortar is made begin spreading it over a small area.
Sand any particularly bad areas of concrete with rough grit sandpaper.
The sandpaper you choose depends on the quality and intensity of sanding you want to do.
After sanding you should apply 2 3 coats of acid wash on the entire surface to hide sandpaper scratch marks from the concrete.
Attach a diamond sanding pad to a hand held grinder.
Roll liquid concrete bonding agent over the surface of the wall in fairly straight lines using a short napped.
Press the grinder.
How to sand concrete walls step 1.
Trowel a 3 8 inch.