When I made my silnylon poncho and a rain fly of the same stuff, I sealed the seams with 1 part clear GE Silicone II and 4 parts camp gas (flammable..at your own risk!!). That stuff is on there to stay, and it's been 3-4 years now with no signs of peeling or delaminating. Talcum powder to keeps it from sticking to itself.
Painted it on with a trim paint brush. It could be sprayed or rolled and goes on very smoothly.
It does help to de-grease the article with some acetone or other solvent before applying, to remove skin oils etc. Wear a respirator.
The only problem I see with it is that it defeats the purpose of the lightweight cloth. It adds weight and thickness. I've never had a misting problem with sil-nylon.
paul, texas KD5IVP