![Wink ;)](./images/smilies/icon_wink.gif)
Ratio is fairly simple: more paraffin for stiff things (leather quivers, ground cloths, tents), less paraffin for softer things (jackets, pants, etc). This is effectively how the first water-proof jackets were made for lumberjacks, and has some validity in antiquity as well. I even did it to a pair of old Nike sneakers that are made of some sort of fake suede. Worked like magic, doesn't breathe for a damn.
Just double-boiler the wax to a liquid, add linseed, brush onto garment, and heat gun into the surface. Some folks buff the first layer in and then heat gun it to make it pretty.
Only issue is in hot weather it will 'sweat', so tents and quivers might get tacky..