High on the Mountain Top
Join Date: Sep 2005
Location: , AB, Canada.
Interest: Backpacking, trail running, spending time with my wife, kids, and dog.
Do you mean Silnylon? UV rays will generally damage silnylon more than comparable PU coated or silicon coated fabrics. It is just too thin. However (big however), you can apply a silicon treatment to the silnylon and it will gain all of its waterproofness back (and then some). But this is over a lot of use, of course.