You can get the stuff at most department stores. I will not darken the doors of wally world, so I would recommend camping department of any other store and look for waterproofing spray or you can get it at Campmor, REI, etc.
I am going to experiment a bit when it gets warmer with making my own brew based on some of the stuff in the thread on making your own sil. I treat 6-8 tents and 2-3 hammock rain flys every year as part of my business. I am thinking a pump sprayer to lessen the propellent. Let me know if you can't find it and I will provide a link.
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