Slip resistant concrete sealer isn't something you can buy. All concrete sealers will have a smooth texture. But there is way too add texture yourself. This is a good idea for exterior concrete with smooth surfaces as that can be a real hazard when it's wet.
While applying your first coat, broadcast fine silica sand over the wet sealer. The easiest way to do this is fill a small plastic bottle with the sand, put masking tape over the opening, poke holes in the tape and just sprinkle it like a salt shaker. Roll a little sealer, sprinkle some sand and so on.
Another method that works is putting a little bit in the palm of your hand, then blowing it onto the wet sealer.
Putting a second coat of sealer on later will help lock in the sand. If you're sealing decorative concrete and you're worried about being able to see the sand, you can buy clear texture beads specially made for this at most paint stores and concrete/masonry supply stores. Click here for more information on concrete sealers.
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