First I draw a line on the balsa where the edge of the glass will go. Using masking tape I tape off the line.

I use slow epoxy and brush a thin layer on the bare balsa. Then I apply the glass using a playing cards to "press" it down into the wet epoxy. Once smooth and before it drys I add a thin top coat of epoxy to to the glass using the playing card to squeege, smooth and remove any bubbles paying particular attention to the side that will SHOW. As the expoxy starts to set-up remove the tape leaving a clean edge. AS you know alcohol will remove the wet epoxy from your fingers or any mistakes.

Gentle sanding and alcohol cleaning of the cured epoxy will greatly increase the iron-on covering adhesion.