One bag will do a good 3"-4" slope in a 75.
When I got my SMS here a month or so ago they said they could order all I wanted. I told them I only wanted 1-2 bags tops and they ordered 11 just to have some in stock.
I'm reading more and more remarks though from different members here along the lines of "there is none available" or "it's being discontinued" so time will tell I guess.
On a side note, if they do in fact have 4 bags it might not be a bad idea to get them all if you can afford it.(They were on sale when I bought mine for 11 bucks and odd change)
You could either have plenty for future projects, or a stash that might be a sought after product soon enough.(I've been considering going back and buying a few more bags myself)
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