Easiest/cheapest way to fix broken tailight
 

What's the easiest/cheapest way to fix broken tailight on my 2007 xle?
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The crack is pretty sizable, so you might just want to replace the whole tail light on your Camry rather than attempting to mend it. From there it's just a matter of buying the replacement piece, removing the damaged one and installing the new one. There are several good "how to" websites if you just type "How to Repair a Cracked Taillight" into a search engine.

An adhesive like methylene chloride may work which is used to glue acrylics. A plastics outlet should have it.

Do a search for TAP plastics, they might have a video on gluing plastic.

This adhesive works well but has zero work time, you need to get the fit right the first time.

yeah, adhisive will drool all over plastic and melt it, making it all look like crap.

find local Certifit store, they have bottom line cheap prices for replacement parts. Swap out entire piece.