Has anyone done it? I see Blackfire sells a Long Lasting Tire Gel that's been polycharged. (presumably H20 version) I wonder if this would add to it's longevity since it's water based it doesn't seem to last long (if it gets wet)
I don't think you need to. When I apply it to a clean tire and use 2-3 coats, they usually only need to be wiped off every few days to clean them. If you use APC, Wheel Brite, or something harsher than shampoo you will need to reapply.