I am reproofing an Isotex™ coat which somebody had previously laundered and destroyed its waterproof properties. I don't know what grade the fabric is, but it is probably not the lowest as the coat has two sets of zippers protected by an overlapping storm flap.

The manufacturer's website care instructions don't give much guidance.

Do I really need to reproof my garment?
Reproofing your garment on a regular basis enhances its technical performance. Every time the jacket is washed as directed on the care label, it should also be re-proofed. Use either Regatta Wash-in Reproofer or Regatta spray-on Reproofer.

I decided to use the wash-in treatment, not a spray. The instruction on the bottle says

Shake well and pour 75ml into conditioner compartment of the washing machine. Wash garment following manufacturer's guidelines.

and some more about tumble-drying and ironing, which I didn't do. The coat was spun and is hanging to dry; I'll turn it inside out when the outside is dry.

I plan to give the coat a second proofing treatment, but

  • hand treat in a bucket
  • start with dry fabric
  • use just enough water plus reproofer to saturate the coat
  • drip dry
  • turn inside out to finish drying

Is this wrong, or am I overdoing this and need only to repeat the washing machine conditioner cycle? Or was the first step already enough?

I would appreciate any advice readers might have on the best course of action. I have read some of the previous questions:
I need to wash my waterproof coat without ruining the waterproofing
My Rab jacket is no longer water proof/resistant after wash

  • 1
    The waterproof a jacket there are two steps. 1) Cleaning step 2) Waterproofing step. For both steps just follow the directions on the bottles. They are there for a reason. Meaning don't skip the tumble drying. It helps set the DWR.
    – noah
    Commented Mar 8, 2022 at 18:35
  • 1
    @noah thank you, I don't have a tumble dryer. The garment advises a light tumble or light iron. I have made a second treatment in a bucket by hand. I will iron it lightly, then repeat to use up the bottle, again followed by light ironing (when dry). Commented Mar 8, 2022 at 18:46
  • I wouldn't iron. It won't be as even and if done at too high of a heat can easily ruin the garment. It's worth the $5 to go to a laundromat for an hour and tumble dry it.
    – noah
    Commented Mar 8, 2022 at 19:07
  • @noah and I won't be able to reach into all the crevices with an iron. The waterproofing will only be as good as the weakest spot. Commented Mar 8, 2022 at 19:09
  • I also don't have a tumble dryer, but could make use of one for a one-off. Or I'd choose a different product. It might be worth asking the manufacturer if there's an alternative approach. I wonder how hot is needed, and whether that temperature could be obtained by hanging it up in a very small room with a fan heater on max (probably directed away from the coat, but maybe finishing off with a hairdryer directly at it)
    – Chris H
    Commented Mar 22, 2022 at 14:48


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