Another useful product for waterproofing is Oilcloth. Authentic oilcloth is made using linseed oil [as opposed to modern cloth which uses PVC]. Real oilcloth can be found at Hamilton Dry Goods, or you can make your own as described at http://www.ebay.com/gds/What-is-REAL-OILCLOTH-and-what-isnt-/10000000000952801/g.html
Bugs Bunny: "I speak softly, but I carry a big stick."
Yosemite Sam: "Oh yeah? Well I speak LOUD! and I carry a BIGGER stick! and I use it, too!" BAM!