Hi,
Thanks for trying our product. The diamond sprays work well on wood surfaces (balsa, pine, etc) card stock, various films, leather, hard felt,
First, shake it up good - turn the bottle upside down as you shake and when the residue that collected in the bottom is dispersed it's good to go. Only takes a minute or so.
The 21 carat is a 4 ounce bottle which yields about 850 spritzes. If you're working on a surface that's 3x11 inches it takes 4-5 spritzes for proper coverage, any more is kind of a waste.
It will dry but a lot of people like to work in a slurry so that's not important.
Another surface I've started to use with good results are Arkansas stones and other hard, natural, non slurry stones. I don't have the science to explain why such stones and slurry sprays work well together but they do.
Thanks again and good luck,
Keith