Philip, I am assuming you are representing AR&G Co. based on your response. It has been almost a year since I ordered the product. I guess a response a year later is better than no response at all.
I guess I will revisit this topic since it has been brought back up.
I purchased both, sand/gravel and rock products. Az Rock did eventually send out some more sand/gravel product because I wasn't satisfied with the texture. And if memory serves, it was the same power I received the first time. I will get it out of my scenic materials box and post what I actually bought and received. It isn't a bad product, actually rather good, but I didn't get the right size sand/gravel product for my O-gauge layout. It is too fine. I need something a little coarser. It will probably work great on my N-scale layout, which is where I plan on using it now. I bought some larger rocks as well that matched the sand/gravel mix.
Outdoor projects have taken precedence over my layouts, so I have made no progress on the O-gauge layout since I posted here and I only got as far as laying the track on my N-scale layout. When I get a chance to dig out the layout and get back to work I will update on the Az Rock products and the progress on the layout. That will probably be a few months from now when I get the project I have been working on for the last 13 months completed.