Or, waxed denim, as the case may be! I've been in need of a water-resistant bag lately, the weather is out of control here! But I'm also due for a new travel bag, we're heading overseas, and it rains in some of those places (i.e. Not Colorado.)
I looked online for advice on making waxed canvas, with lots of differing recipes! Many people used Otter Wax, which is a great choice. However, I already have a huge chunk of beeswax at home, no need to buy something. My plan was to make a rub-on wax, which has to have something added to it as beeswax is just slightly too hard to rub on when pure.
SCIENCE TIME BITCHES!
I tried three recipes, a few drops of linseed oil, olive oil, and turpentine (no idea if modern synthetic turps is suitable for this, I used what I have!) Melted each one with beeswax, and then cooled them into cakes. Which were stuck to the jar. >.< (I tried running hot water on the outside, I tried freezing, they were stuck!) So I added water, then melted and cooled again. The wax sits above the water and can be dislodged from the jar more easily.