i have put sand in sealer when doin stained cement sidewalk at resturants where they need traction , it works ok but the sand is heavy and wants to settle to the bottom of the paint so you need to make sure you are always mixing it. paint stores also sell a product that is a powder that floats in the paint instead of sinking it is made for the non-skid application i would go with this product instead of sand next time i have to do this
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