Igower,
The way we do it at the shop is to start with taping off the area does not get non-skidded, sand (grind) the area to be non-skidded then clean it with acetone, then we apply a self etching primer using a household paint roller (thin coat) after the primer dries apply an even thin coat of paint, color of choice, using a paint roller (we use acryllic enamel) sprinke play sand (local hardware store) using a cup. After it's covered blow off excess sand and apply a top coat of paint. Let it sit about 15-20 minutes and then pull tape before it dries all the way. Good luck, I hope this helps you, let me know if you have any questions.