I have done this 2 stage NikWax process with a Palm Silver semi-dry suit I had. It helped, some, but the repellency seemed to disappear after a couple of uses. Now have retired that dry suit and use a Kokatat.
I guess it is worth a try, but be ready to re-apply.
Wabakimi Canoe Pack
Kayak Deck Gear Bags
PFD's (Life Jackets)
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