I use 5 minute epoxy. I start by securing the topmost parts of the canopy. Once I have canopy properly positioned, I tape as much of the canopy and canopy frame as possible with blue masking tape to protect it from sticky fingers and drips of epoxy. I then apply a heavy coat of petroleum jelly to exposed, untaped areas of the canopy and the canopy frame.

I then apply epoxy to a couple of inches of canopy at a time. I work from the middle out, whenever possible I apply epoxy from the inside of the canopy and the affix as many clamps as possible. Once the epoxy starts to gel I clean the joint up and remove the vasoline with small amounts of 91% isopropyl alcohol (too much alcohol weakens epoxy) and the back edge of a hobby knife. 5 minute epoxy remains soluble in alcohol for about 20 minutes.

if you use enough clamps, this method completely fills in the gap between the canopy and frame.

Our UB came out pretty good with this method.

Phil