Sanding the wall can often take care of the problem but it is difficult to sand a very large surface smooth and you might end up with places that are recessed while others are higher making the wall look worse than before.
How to smooth concrete wall surface.
Evenly coat a 2 by 2 foot area.
This is still true to a great extant.
Form or mold surfaces be as smooth as possible to decrease the surface tension between the concrete and the mold.
The proper release used on a rubber mold will give the best possible surface.
Getting a perfectly smooth surface requires some skill.
Unless its hideously rough i would just skim coat it with quikwall surface bonding cement.
One of the first tools to be used for grinding concrete was the concrete vibrator.
Apply the slurry to your new concrete wall by holding the trowel blade to the wall so the slurry is pressed onto it and wiping the slurry across the wall with a smooth arcing motion.
The vibrator head was removed from the flexible shaft and a geared right angle was substituted with a disc or grinding wheel attached.
On may 26 2017.
A float compacts the concrete surface giving it a smooth look.
I bought a place near the ocean that has concrete block walls.
I m vibrating the concrete but still have bug holes in the casting.
You can continue to smooth out the concrete with the trowel or squeegee.
Rubber molds are being used more and more for just this reason.
If concrete is applied to a wall incorrectly the first time it can feel rough or uneven.
You can also texture the surface with a brush or push broom.
There are basically two methods used to smooth off hardened concrete surfaces.
We ll show you the tools and how to use them for each step of the concrete finishing process.
How do you smooth a rough concrete wall.
I would call first to be sure it can go over the paint.
Putting a smooth durable finish on concrete is a skill you can only master with the proper set of tools and practice.