This is a bit beyond the remit of GBA but I’d be grateful of any advice.
My main floor is a sealed concrete slab. it is now 25 years old and needs renewing. The original sealer was Xylene-based, and I’d prefer to switch to a water-based one.
The advice seems to be the only way to do that is to remove the first sealer. I think it would sand off fairly easily, but some will have penetrated the surface of the concrete. I wonder if the water-based sealer will adhere if there is some residual in the slab?
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