I use regular 30 minute epoxy and then trim it out with pinstripe tape like jeffie suggested. But no matter what method you use, wash the canopy with dish soap to remove the mold release compound and scuff up the edges where whatever adhesive you use with something like some Scotchbrite or steel wool. When it comes to adhering to the Monokote, scuffing that up is a good idea too but if the Monokote isn't sticking to the wood very well, you may have to get creative. My first thought would be to punch holes through the Monokote into the wood so whatever adhesive you use penetrates into the wood itself.