Just stitched myself a nice little haversack from a heavy hemp fabric, and am thinking I would like to apply some waterproofing. I tested a couple swatches, one with beeswax diluted with turpentine (essentially a homemade paste-wax; the turpentine allows it to go on easily without melting), and the other with boiled linseed oil (BLO). I really like the way the BLO gives the fabric some stability -- it's almost like leather. However, based on past experience with linseed oil ("teak" oil) and linseed oil based varnish on boats, I found that it doesn't hold up so well to UV light, and ultimately becomes brittle. I like the idea that wax treatment is easily renewed, but it doesn't seem to offer the same protection that the oil does. I'm also thinking that the BLO would help stabilize the fabric and improve wear resistance. Does anyone here have any experience with BLO treated fabric? Did it hold up over the years, or did it get brittle? Is it really significantly better to turn it into "paint" by adding some iron oxide powder? Am thinking that probably helps with UV degradation, but don't know for sure. Any and all input/experience much appreciated!