Option One: buy some very expensive “specially” formulated paint from a chandlers with a non slip additive in it.
Option Two: pop into B&Q get a tin of exterior masonry paint tip in some sand. Job done.
Mate did option one on his boat and it has worn off after one season. He then read about option two, gave it a shot and guess what has lasted with out any ware showing. I honestly think this is the way forward and I am looking to do this on the RIB once I get a deck fitted…
The only thing is it dose like a good bake in the sun to go off fully, so pick your day.