Rooftop AC/Heater leaking

I have a rooftop AC/Heater that I will be replacing in spring. The same time I will also be replacing the roof and attic insulation.
However we had a heavy rain overnight, and this morning we heard drip drip drip above a ceiling light. Put a tarp over the approximate area, and the dripping stopped. However so did the rain. Took the light housing out so that any offending dampness could dry up. Then decided to enter the attic for a look see.
I did not find any sign of water on the underside of the roof.
The insulation was wet, not from saturating water, but probably from a constant drip. Looked up and saw daylight around the base of th AC/Heater unit. This tells me that I should be resealing the surrounding area where the unit meets the roof. Right now I have decided to relocate the large tarp over the unit, fanning any excess tarp away and over the roof, stapling it down. We are not expecting more rain until tomorrow. In the meantime I plan to get some sealant. Can anyone recommend a sealant for the base of the unit? Should I be using a caulking material and/or paint/tar/tape? I dont care how it will look.

Thanks for your patience in reading my post. Just wanted you guys/gals to get the whole picture... Happy holidays!



Mark

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don't know how big your unit is but a gallon or so of cold tar would meet your needs till spring.it is black though but won't jack your wallet as much as caulk i should think.