DIY Underquilt - Sealant?

**foolhardy** · 10-05-2010, 10:56

I am attempting to convert a cheap, light ~40 degree sleeping bag into a winter underquilt, to use in concert with my 0 degree mummy sleeping bag. Would it be a good idea to seal the outside somehow, making it wind proof?

If so, what light/thin spray-on sealants are out there? I found this on Amazon, would it be the right stuff for sealing a sleeping bag?

http://www.amazon.com/McNett-36221-R...6294044&sr=8-5

**Lonely Raven** · 10-05-2010, 10:59

Maybe just get some silnylon and sew up a cover?

**foolhardy** · 10-05-2010, 11:01

So then you're saying that it IS a good idea to wind/water proof a winter UQ.

It doesn't need to breathe at all?

I do like the silnylon idea.

**canoebie** · 10-05-2010, 11:10

I would not seal it, a personal preference. I think more insulating value is lost by retained moisture as a result of sealing than would be lost by exposure to the elements. It should stay dry if your rain fly is adequate, and the ability to breathe will allow any body moisture to pass through. I have an IX UQ with a layer of breathable 1.1 oz ripstop and I really like it. My wife has a sleeping bag UQ with a DWR ripstop and she sometimes has puddles of moisture between the bag and the DWR.

**foolhardy** · 10-05-2010, 11:12

Wow, okay. I guess I won't seal it after all.

Thanks for the input folks.

**oldgringo** · 10-05-2010, 11:44

Windproof good, waterproof not so good...don't abandon the idea, just modify it.

A good example of what can be accomplished with a layer of high threadcount nylon can be seen in those jackets that are nylon over fleece...crazy warm.

**canoebie** · 10-05-2010, 11:46

Originally Posted by oldgringo

Windproof good, waterproof not so good...don't abandon the idea, just modify it.

A good example of what can be accomplished with a layer of high threadcount nylon can be seen in those jackets that are nylon over fleece...crazy warm.

+1 on that. GMTA!!