I've got a bunch of Filson Tin Cloth and Shelter Cloth garments for extreme
brush and woods hunting conditions. If you use "Filson's Original Oil
Finish Wax" http://www.filson.com/1A.HTM you could probably soak the Carhart
enough for it to be relatively water proof. I've retreated some of my
heavily used Filson garments several times using the following methodology:
Put the tin in hot water to soften it up. Then spread a heavy coat of the
wax on the garment and use a blow dryer to melt it in.
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