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Yes, you should definitely use a spray-on. Arcteryx themselves explicitly state not to use wash-in (product care information) and Gore-Tex does it implicitly by telling you to apply "to the garmen...
Answer
Yes, you should definitely use a spray-on. Arcteryx themselves explicitly state not to use wash-in (product care information) and Gore-Tex does it implicitly by telling you to apply "to the garmen...