Jim,
It's not actualy watertight, it's more water resistant. You will most likely be dropping a portion of it sometime in the future.
when my camper was built the factory used No. 8 self drilling metal screws. Most of them have been overtorqued and stripped, I replaced them with No. 10 metal screws and used 5/16" fender washers to provide support.
Some builds still use the screws, but the power fasteners are being used more now. They are a pain to get out, most guys use a chisel and cut them off.
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Jim
When I was a kid I was going nowhere fast, now I'm an old man I'm going everywhere slow.
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