I went out and bought Fletch Tite as recommended above.
It worked great!

Takes about twenty to thirty minutes to set...I had to hold a couple of gaps flat by hand...however, after it set overnight, it is clean, tight, and strong. I believe he wasn't joking when he said it would take a screw driver to pry it off.

I recommend the slower drying solution. It will give you time to correct mistakes. If your canopy fits perfect, the quick dry may be OK. I had a couple of gaps. After I let the inititial set dry, I went back and filled in the gaps and held it down. Now it's smooth all the way around .