Concrete walls are most common in basements and are prone to water and chemical damage causing discoloration cracks and leaks.
Mudding concrete walls.
Sometimes is easier to chip all of the mortar off that to mud over it.
You ll get shrinkage if you mix it too wet.
Concrete walls are also used in industrial buildings such as factories and converted downtown lofts.
Use the all purpose mud for your base first coat to seat or cover the tape and lightweight mud for the final coat.
Bag of portland cement into a wheelbarrow.
Fold the two materials together with a spade until thoroughly mixed.
Spread a layer of slightly thinned all purpose joint compound on the walls with a heavy nap roller.
After a while it will show splotches of discoloration then it will peel off.
There are several brands and grades of mud.
Mix all purpose joint compound to about the same consistency as mud you would use for bedding tape the consistency of mayonnaise or just thin enough to roll on the wall.
Such walls have been subject to much abuse and become disfigured with hairline cracks holes and chipping.
Of masonry sand and half of an 80 lb.
The right plaster can be smoother than drywall.
Push the sand through the screen to sift out any gravel.
I d suggest doing as the locals do and use materials they use.
Get enough mud for your job.
As a rough estimate figure about 1 gallon 3 7 liters of mud for every 100 square feet of drywall.
Mud over concrete does t work.
And finally check the mortar before all of this simply tap on it with the hammer and listen for the hollow sound.
Sift any rough material from the sand before pouring into the wheelbarrow using a screen placed over the wheelbarrow.