mark wrote:

I have considered using an oil based
floor and deck enamel, and spreading sand in top of it, then
repainting over the sand.


indoor outdoor carpet? Also, if you don't want to go the sand route --
there's paint with ground up rubber bits already in it. You just roll it
on.

stuff like this: http://www.allstatesign.com/anti_slip_paint.htm



Take a look at this: http://www.pro-tect.com/faqs_water_shield.shtml