Treating down puffy?

I’d give it a good wash using quality down wash, then use ReviveX on the exterior and call it good.  I’ve not heard of any user-applied DWR for down.

I have been using Nikwax Downproof for decades

Any clumping is caused by not tumbling the article for long enough, not rinsing properly or forgetting to put a shoe in with the down garment

You need to wash first of course to get all the dirt out

Nikwax isn’t a miracle product but it comes close, it will add a little weight to the garment, about 1%

I’ve not used any of the other productson the market but I’ve been told that the Graingers product is the same

Nikwax Downproof

I stand corrected.

Maybe no to Downproof

https://backpackinglight.com/forums/topic/30554/#post-1589908

All I can say is that I have been happy with the Nikwax downproof product

My old Everest bag uses 900 Fill-power Polish down and after almost 30 years and three washes and reproofing I see no more degradation that would be expected in a 30YO down bag

I actually have two of these very specialised bags, an UL using 900FP down and a normal LW using 650 down. Both washed and treated almost equally and neither shows any signs of failing loft or down degradation and in my instance Nikwax was recommended by the maker [ J&H now One Planet ] because 30 years ago hyperdry down wasn’t available

Yes 900FP down was available 30 years ago if you were prepared to pay for it, most etheral amazing quality stuff no longer available due to new EU laws than ban even ethical live plucking

That is exactly what I was thinking of using. This stuff: http://www.nikwax.com/en-us/products/productdetail.php?productid=269&itemid=-1&fabricid=-1

The jacket is probably from the late 90s early 2000s I would say. Its one of the Eddie Bauer quilted jackets. Its not the lightest thing and it loses loft pretty quickly because there isn’t much of a DWR coating either – though the shell is nylon. I wonder if its worth trying to DWR the outer nylon instead.

I will check out the thread on Nikwax Down Proof, thanks!! I don’t want to ruin this jacket. But it would be really cool to take it on this hike (the Adirondacks were a favorite!) Even if it doesn’t hugely improve the situation, I can’t imagine it getting worse.

Certainly there are several products available that people have used successfully…brand loyalty is a powerful thing :)  I have used McNett ReviveX many times on both jackets and sleeping bags and it works beautifully. First wash with down wash (I use McNett’s product), spray on wet and then run it through the dryer on LOW with several (new) tennis balls, or balled up socks.  Takes a very long time to dry but when done the loft is back and water beads like on a hot skillet.

No offense to anyone who likes the wash in down waterproofer, but since there are published user’s opinions both pro and con, I would err toward caution.  I can’t help but question why the new generation of factory-applied down DWR was developed if a wash-in down waterproofer that was equally performant has been available for decades?  Again, no arguments intended, I just have questions.

I’d just like to point out that factory applied down waterproofing is in fact the Nikwax product in many instances.

Perhaps also there are places where it is much wetter and soggier and Hyperdry down is more popular in these places. or for people who may be spending weeks or months sleeping in these conditions