I built 2 planes and covered one with nylon and the other with bi-directional tape and colored tape.

Fuselage with tape gained 2.3 ounces from the covering job which consisted on 1 layer of bi tape and 1 layer of colored tape

Fuse with nylon gained 1 ounce

Wing with tape gained 9 ounces. One layer of bi tape and one layer of colored tape

Nylon covered wing gained 6.5 ounces

Weight savings of about 3.8 ounces
I may have used more tape than needed, but I like the entire plane to be covered with some armor.

It took me more hands on time apply tape than to cover with nylon but there are no drying steps in the tape job so that is nice. I think the ripstop is stronger as well.

With Terry's stick on ripstop there will probably be more weight savings. Not to sure on that though as I haven't seen the material yet but I would think the adhesive would weigh less than the WBP I had to add.

That's what I found so use it as you like!