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| p.1 #9 · help with cracked plastic |
If it's possible to place a thin piece of plastic over the crack and glue that down to the lens, instead of putting glue/cement on the crack itself the bond will be much stronger, but maybe that's impossible given the crack's location. With any type of glue, surface area is your friend -- the more surface that is covered by clue the stronger the bond, regardless of the type of glue.
I'd second using a plastic epoxy (like JB weld) and would shy away from PVC cement since that's meant to bond a specific type of plastic (pvc) and does so by dissolving some of the plastic - and I don't think the lens is pvc.