I would go to Sherwin Willaims and ask if they have a suitable CLEAR coating that can be applied with an additive like SHARK GRIP to give you a not slip surface, if you are looking to DIY. If you want this done by a company, I would contact driveway painting contractors, we have used Driveways by Jay (Hometown Services) and found his work to be very good. I do not know if he does overcoating.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV.
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