Using NAPA Floor Dry in the gritty mix.
In previous posts, Al and Josh explained that the role of the grit component is to balance out the water-retentive property of Turface: more grit & less Turface if one wants the mix to hold less water, and vice versa if more water retention is desired.
I've read that NAPA Floor Dry is an acceptable substitute for grit. the NAPA stuff absorbs liquid (that's its characteristic). So if Turface and NAPA Floor Dry BOTH retain moisture, wouldn't that render the gritty mix super saturated?