I re-stained the deck around my AGP last year, it looks great now, but I found it can get very slippery if one has wet feet, which of course, happens all the time. I googled and seems most products out there are designed more for concrete or composite. Also, I don't want anything too abrasive because this is a surface that will come into direct contact with bare skin.
I did find this which at least suggests it is comfortable to bare feet in the product description:
Suggestions or personal experience?