I concur,
a bit of black silicone adhesive/sealer around the edge, and use your screws from the inside to hold it, should keep you watertight.
I prefer the adhesive/sealer for its glue like property as well as the sealing it provides.
For a few pennies less you can get silicone sealant, without the adhesive property.
My .02,
S.
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When you are courting a nice girl an hour seems like a second. When you sit on a red-hot cinder a second seems like an hour. That's relativity.
Albert Einstein
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