wrote in message
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What is the best way to seal it up and prevent any leaks from coming
through the flat metal roof?

If it is really only to be 2 months, then the obvious solution would be one
of those cheap tarps available at a place like Harbor Freight.

For a more permanent solution, consider a couple thick coats of the
elastomeric roof paint sold at the big-box home improvement stores in the
roofing section. Wash well before you paint. Seams can be covered with the
4" wide roof patching tape available at the same source before painting. I
have sealed the roof of my home with this stuff. It stands up to Florida
hurricanes when other roofs fail.

Vaughn