My brother in Law also swears by Sno Seal on his motorcycle leathers as a water proofing agent.
I should have also explained that my motorcycle gear is mostly Goretex.
I respray it before winter every year with Selleys and have not been wet yet.
Selleys is also recommended for waterproofing tents as well.
Other products you can try are Nixwax and Grangers.
Cheers
Pete
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