A couple of years ago I recovered a plane that I built around 1980. I found the remains of the original roll of Monokote and use it. I was recovering a fuselage that was partially stripped for repair after a rather malicious tree intentionally jumped into my flight path. I was surprised the material on the roll, that had been stored in a box in the basement, still matched the covering on the fuselage that had been exposed to light and UV for 25 years. The material felt and acted just like it had just been manufactured.

I've also experienced variations in the adhesive. I've used 2 rolls that I know came into the hobby shop together directly from Top Flight. One roll didn't want to stick very well, and the other was probably the best I've used - very tacky, and I was able to tack it in place by pressing my hand on it for about 20 seconds before starting to iron. It also stuck when the adhesive side folded under and touched more adhesive - when I pulled it apart I ended up with the clear plastic film in one area and all the adhesive and color pigments on the other part.

Hogflyer