I have an old (20 years) Northface Tadpole tent that I am going to be using on a short trip. I have not used the rainfly in years and there is a chance of a little rain.
The rainfly is made of nylon and I have never treated it before. I know that you are supposed to treat the seams on the inside, which I have done with a seam lock.
My question is, I see two different types of water repellent offered at my local hiking supply store – Tectron (non silicone) and Sno-Seal Silicone Water-Guard. Which would you recommend for my rainfly? Should I apply this to the inside or the outside of the rainfly?
Thanks in advance for any help.

