For the smoothest finish use superfine sandpaper 200 to 400 grit or higher.
Sanding concrete walls smooth.
Spray the wall with a light mist of water.
5 smooth the concrete.
This grinder is mobile but still effective in smoothing rough uneven concrete before polishing with a fine grit grinding paper.
After dampening the surface and before it dries a mixture of dry cement and sand is rubbed over it with a wad of burlap or a sponge rubber float to remove surplus mortar and fill the voids.
Choose coarse grit sandpaper in the 40 to 60 grit range for basic sanding and stripping.
Allow the surface to thoroughly dry remember concrete is porous so give it a day or two for the best results and apply a concrete sealer.
They are dry grinding and wet rubbing.
The belt grinder is used strictly for removing and grinding large amounts of concrete.
These grinders are also hand held.
Patches of cement are often uneven and stand out from the rest of foundational walls especially if cracks in the original walls necessitated the repair.
Wipe the surface with your sponge to remove the debris then move to the next finer grade of sandpaper.
Dry grinding is done of dry concrete surfaces to remove fins and marks caused by forms.
You can make it smooth by using the second finest sandpaper you have putting your sander on the highest speed setting and then beginning from one corner of your concrete surface and finishing on the other.
For smooth finishes and removing minor imperfections use 80 to 120 grit sandpaper.
This sandpaper is made using diamond when traditionally sandpaper is made using sand.
However they are fitted with 60 grit sanding belts that spin at high speed.
The best way to create a smooth surface for your wall is to limit your sanding and apply a thin overlay of correctly finished new concrete.
There are basically two methods used to smooth off hardened concrete surfaces.
If you don t use the right sandpaper you will not be able to complete the job.
Sack rub sack finish a finish for formed concrete surfaces designed to produce even texture and fill all pits and air holes.
Remove uneven patched areas of concrete by sanding it with an angle grinder.
Rinse and repeat literally until you ve reached the desired smoothness.
Start at the bottom corner of one wall and in a single.
It s critical to your overall success.
If you use a wet dry sandpaper you can wet the area before you work to keep dust down.
Wet the pointing trowel and hold it upside down as you scoop the mortar loading up its lower side.
Step 1 sand any particularly bad areas of concrete with rough grit sandpaper.