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We just poured in place some concrete countertops. My finisher hard troweled it as best he could. In most places it looks like honed stone. But in some places there is a little cream that has set up in little ridges. The homeowner wants it FLAT. My finisher doesn’t know what to do, nor do I. I was thinking of hitting the cream with some 600 wet sand paper, but one of my carpenters says there is a stone you can use too. Anyone have any ideas or know what kind of stone this might be? We do not want to expose the aggregate.
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Replies
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He may be referring to a carborundum stone.
*Greg,the people who polish granite use various wet stones down to a mirror finish but I'd be worried about the difference between where you've ground it and where you haven't. A carborundum sharpening stone, used dry, will take off the ripples for sure, but you might have to go over the whole top to blend it in.
*WE have used the 9" angle grinder with a carborundum wheel . Use a masonary to get the ridges and a steel one that has been used to polish the top . The steel carb. wheel will not cut concrete very fast and if it is used it will have a rounded edge . Run it flat to blend the whole surface. You be the judge. Next time take Mongo's advice pour inverted. Maybe you will need one of those hand stones if the ridges are not too large , but thats the finnishers job so it wont be to hard. I think that the angle grinder will expose the gravel .
*FWIW, I saw a guy on TV finish a concrete counter top with a random orbit sander and fine sandpaper. Did it REALLY wet and it came out polished as can be. Why worry about a stone, unless getting gritty water everywhere is a problem?Agree that you would probably be committed to doing the whole surface.
*Have not used it but this tool is the one the counter top guys use. http://www.concretenetwork.com/products/ds_301.htm
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We just poured in place some concrete countertops. My finisher hard troweled it as best he could. In most places it looks like honed stone. But in some places there is a little cream that has set up in little ridges. The homeowner wants it FLAT. My finisher doesn't know what to do, nor do I. I was thinking of hitting the cream with some 600 wet sand paper, but one of my carpenters says there is a stone you can use too. Anyone have any ideas or know what kind of stone this might be? We do not want to expose the aggregate.