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You are right, JoAnn's typically has only uncoated nylon ripstop which does mean it is not waterproof (or water resistant). Fabric of this sort is just called "nylon ripstop" not silnylon. Silnylon is slang for "silicon impregnated ripstop nylon", essentially a specific type of waterproof coated ripstop nylon. Walmart never has silnylon in stock except for occasionally in their "bargian bin" section which is miscellaneous fabric of "unknown origin". I dont think they carry any sort of ripstop at all in their regular stock (although if you are lucky you can also find this in the bargain bin).
Edited by karacolor on 09/03/2007 22:14:35 MDT.
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