I just had to try this, having all the bits needed I knocked up this tinder pouch today from 15oz cotton canvas. Then once finnished I started to apply fairly thick coats of Barbour Thornproof Dressing to the outside, once completely covered I took to it with my wifes hairdryer (don't tell her) until absorbed. I done this a total of five times until you can see that the dressing was showing on the inside.
I don't want this really waxy on the outside as it can get everywere, so I am going to use this for a while and then give it another couple of coats. I am really happy with the end result, however if you want a waxier finnish just keep adding coats of dressing until you are happy.
The pouch before treatment:
And after five coats of Barbour Thornproof Dressing :