3 m has a scotch guard spray can, scotch guarding frabic repells water and stains, it does a good job, true i never deliberately stood up in rain to see how efective it is but it makes me feel a bit safer with it on.
I have heard of some users using a waterpepellant spray that can be found in sporting good stores that are cheaper but i prefer to use brand name products and 3 m is a reputable company.
BTW how blue is your f6 ,never seen it in that colour?

Dave
Nikontrini