I would say, just like a glue up for colored glass.....to ensure no air bubbles, make sure you are gluing up in decently warm conditions, and ensure you have glue on every piece of both lams. If you are using an air hose form, when gluing it up... I usually give it 30lbs of air and let it sit and squeeze out, then up to 45.....then up to 60 (rather than straight to 60 all at once).