I will suggest using GOOP marine glue, this seems to be a little tougher than the typical silicone sealant. I have used this on several projects, including one that is outside in the birdcage for almost 6 years, and still in excellent condition. This product is available at ACE and the big box stores. Allow over night drying time.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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