I did only the one side and it's holding well.
You might need something a little more sticky or heavy duty
I just recently tried Screenmend. What I know is that I used on the inside of my toilet and it held up well. I will be able to use the same Screenmend piece over again at least several times.
Will not stick to ANYTHING as the adhesive remains on the screen backing.
I believe the product is either fiberglass or plastic. It has an adhesive coating on it that you use a hairdryer on to heat up to get it to stick to the old screen. It applies very quickly. My job was done in less than a minute. I was very satisfied.