Im looking for DWR spray to use on my gortex jacket.Most of the sprays I have seen are water based such as nikwax and now grangers since they discontinued their fluorocarbon-based sprays.
What DWR spray do you use? and are there any fluorocarbon-based DWR sprays around
the fluorocarbon based C8 chain treatments are highly toxic and persistent in the environment and have been banned in the countries where they are produced...
they lasted a lot longer than the new C6 chain chemicals.
some fabric manufacturers are looking at using stronger polyester materials for their rain shell because the DWR chemicals bond better with polyester
might have been marmot, cant remember that has a material with DWR built into the fabric rather than applied
columbia use polyeurethane material as the face fabric that repels water better.
the dwr treatments have nothing to do with waterproofness
they are used to reduce water buildup on the surface of the jacket
the waterproofing comes from hte inner membrane covering the woven face fabric,
there may be a knitted layer covering the membrane on the inside
the membranes wont let water vapour out once the outer fabric has wetted out..
so the dwr keeps allowing the water vapour to move through the membrane..
water will only get through the membrane from the outside in high wind conditions or in some situations depending on the membrane from a lot of pressure on the fabric, some cheap ones, sitting on the membrane or pack straps will be enough to force water through.
sometimes when theres moisture building inside rainwear people think its water leaking in, when its sweat not getting out.
hwen you're exercising hard, a closed up rain jacket will not let all the sweat out even before the face fabric wets out.
high humidty slows the amount of moisture that can get out of a rainshell, low himidity allows more through, also colder weather works better for letting moisture out.
the figures for moisture transfer through membranes are from ideal conditions in laboratories..
when its raining a lot and you're exercising hard esp in warmer weather dont expect to stay dry even if your DWR works...
This post has been edited by the author on 8 June 2018 at 09:54.
I get that it’s the inner membrane, my comment was not well worded. Basically my experience with the Gecko Guard is that rain beads off like a champ initially hen starts to bead less effectively - it doesn’t cling but is slower to run off. I couldn’t give you figures about how long it lasts as I don’t really keep track of that, but I figure it must still be effective in maintaining the breath ability of the membrane as I don’t get that sweat buildup that you refer to.
its hard to get DWR back to what it was when it was applied in the factory.
good dwr usually needs a lot of heat for it to get it to work properly
you may have to iron the material or put it in the dryer..
it seldom lasts long when you reapply it...
things like how shiny the fabric is affects it a lot,,
a lot of nylon materials have a mat finish to avoid the shiny tacky look, but i find those fabrics dont retain DWR well in general...