canopy glue or black pvc electricians tape 3/8" wide seal the edges afterwards with a small brush and polyurethane.for scale planss the canopy masked off completely except for the bottom 1/4 in or so that is the frame.canopy is just tacked in place then resin and mixture of micro balloons is applied to the fuselage and canopy and smoothed out as much as possible till it cures/hardens the carefully sand the mixture smooth and feathered in to the fuselage and through to the tape line to leave a nice sharp panel line.some arf's are using screw these days.