I have heard mixed opinions on using wash-in DWR (i.e. Nikwax TX.Direct wash in or Gear Aid Wash In Water Repellent or Grangers Wash + Repel) for shells and other garments (some people say that it reduces breathability by filing the pores of the the interior).
I haven't seen much on synthetic fill garments and how using wash-in DWR will affect them. I ask because I'm looking at a used PrimaLoft jacket that was washed with wash-in DWR, and I'm wondering if that's going to significantly negatively impact the breathability and insulation capabilities of the jacket.
Does anyone have any information or thoughts/experience with this?
