Decordezine gives the steps for sanding concrete floors along with the tools and preparation needed for the whole process.
Sanding concrete wall before painting.
Again wipe away any debris and allow to dry completely.
Diamond head concrete.
Don t put a lot of pressure on the sanding.
Sand the walls from the baseboard to the ceiling with fine grit sanding paper on a sanding pole.
Scuff sanding not only helps remove the old product but it gives the concrete surface a slightly rough texture.
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For oil based paint a medium grit sandpaper 100 to 150 grit should be used.
My walls are solid 4 thick concrete slabs.
You ll want a high shine for clear sealant and stain.
However there are some things to consider when painting a concrete wall.
Sanding walls before painting for the best results use a good quality sandpaper i like 3m s pro grade advanced sandpaper available here and a sanding block this one is the best i ve found.
Dust from floor sanding will not damage newly painted walls.
If you do end up sanding again don t forget to sweep again too.
Then sand horizontally along the baseboard and ceiling.
Damage to walls from floor sander is easier to patch and paint over than the opposite.
Press the grinder to the wall and begin applying firm pressure.
Sanding a concrete floor helps level its surface and is a common practice before painting it.
The annoying thing is they have a subtle texture to it.
For previously painted water based paint sand with a fine grit sandpaper.
Sand any areas where the paint failed to adhere.
After a few minutes the concrete will begin to have a slight luster.
Scuff sanding is also the first step in preparing newly cured concrete for painting.
Apply a second and final coat of paint to the concrete.
Smoothing walls before painting is necessary for surfaces previously painted with a gloss or high gloss paint.
Painting a concrete wall can spruce up an area or make it blend in with the rest of the area s décor.
Refinishing floors before painting walls pros.
Move the grinder up and down and back and forth across the wall.
They aren t dry wall smooth but don t have an interesting pattern either instead i m left with a random scale like texture around the room with some areas worse than others.