I've attempted to cast a concrete slab that we plan to use on the bathroom vanity. I've even tried it twice, so now I have two slabs and will choose the best one.
Unfortunately, the surface of both slabs turned out either uneven or "blotchy," so I'm now considering how to treat the surface to make it look nicer.
Is there any type of paint that resembles concrete that I can use to paint the slab? Perhaps I can mix new concrete and just apply a thin layer? I've heard something about "cement milk," but can't find any information about it?
I won't be casting another concrete slab but want to treat the best of the ones I've already made.
I have already tried sanding but the sandpaper wears down almost immediately so unfortunately it doesn't work very well. Maybe there is sandpaper specifically for concrete. I'm still considering some type of paint or other type of coating that can be applied. Does anyone have any ideas?
I have already tried sanding, but the sandpaper wears down almost immediately, so unfortunately it doesn't work very well. Maybe there is sandpaper specifically for concrete. I'm still considering some type of paint or other type of layer that can be applied. Anyone have ideas?
You need to use silicon carbide sandpaper for stone/concrete. Bosch has a series called "Best for stone" which is quite good. The fastest removal is achieved with a diamond cup wheel for the angle grinder, which is usually the best to start with to plane the surface and remove the cast skin. Using paint or a fully covering surface layer is a shame, as you lose the whole point of using concrete as a material in my opinion, and the wear resistance becomes significantly lower.
I cast a new slab. See results below. The issue with mottling did not occur on the new slab.
But - after reading several different threads, I decided to treat the slab with linolja. I have now done this twice. However, it's not enough since the slab rather absorbs the oil, instead of forming a "film" that protects against water and other substances.
So my question is how should I treat it now to get a surface layer that provides good protection against water, soap, etc., that will be spilled on the slab.
I cast a new slab. See results below. The issue with streakiness did not occur on the new slab.
But - after reading several different threads, I decided to treat the slab with linolja. I have now done so twice. However, it's not enough since the slab rather absorbs the oil instead of forming a "film" that protects against water and other substances.
So my question is how should I treat it now to get a surface layer that covers really well against water, soap, etc., which will be spilled on the slab.
Grateful for tips!
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Hardwax oil or floor lacquer in the bathroom.
Since you didn't sand and seal the slab with vattenglas (too late now unfortunately since you've linoljat), you'll have to expect that it will take quite a few coats before you build up a sufficiently thick film on the surface.
I'm jumping on an old thread on the topic with my question about grinding a concrete countertop. I've cast two out of three slabs for the kitchen, and I've attempted to sand the first one with stone paper in an orbital sander... It took forever with coarse paper, and it's still not good! I'm considering switching to diamond grinding for the initial rough grinding. However, I don't want to spend a fortune on this project, so I was thinking of buying a relatively cheap grinding disc for a regular angle grinder. Is this a reasonable idea? I have no experience with this type of grinding at all. Is it easy to accidentally grind gouges and marks or remove too much? Is it possible to wet the concrete before grinding so it doesn't dust like crazy?
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