There is an excellent canopy glue that's easy to use and works great. It's called canopy glue. Yeah, canopy glue.

It's in a small bottle and looks somewhat like white glue. Matter of fact, it handles just about exactly like white glue. However, when it dries it turns clear and is almost invisible.

You run a bead that you think will adequately fill and possibly extrude extra to the outside. When you lay the canopy on, press it down and any glue that squeezes to the outside is very easily wiped away with a damp paper towel. The glue will provide a decent tackiness that'll almost hold the canopy itself. But I usually use a couple of strips of masking tape to make sure.

After about a half day, I pull the masking tape and use striping tape to cover the outside joint line. Makes a very nice job of it.

I've also used the stuff along the horizontal stab to fuselage seam, and of course along the vertical stab to fuselage seam also. It seals those seams perfectly. When it dries it's basically clear. It keeps out any exhaust residue that might flow back down the fuse and into the seams. It's dead simple to do and takes no time at all. I used to iron on a strip of Ultracote over those seams but had some trouble when two colors came together. No trouble with the glue since it dries clear and see through.

It and hinge glue have turned two pita jobs into troublefree minor efforts.