/ fabric conditioner as waterproofing
no. if a waterproof reachable membrane it is not recommended.
Clogs up the breathablity.
A big fuss was made about this a few years ago, in Trail magazine, IIRC.
I wouldn't recommend it, as the formulations of conditioners seem to change all the time, so you've no idea if the one you buy will work as a DWR, or just knacker your jacket... At least the products sold as DWR treatments are intended for that purpose, even if they don't always seem desperately effective...
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