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Oversized two car garage with flat concrete roof which serves as Terraza, about 20 years old, 

that leaks badly in several places during rainfall. Bids on roof repairs/replacement are higher than current budget. What is the absolute best roof sealant for this job? Longevity more important than cost. Thank you.

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As above - Fester 12 yr. white.   Only thing I would add is to seal any cracks that are visible first with SikaFlex or lay down a strip of fiberglass cloth and coat over with the Fester.

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Cracks indicate movement, and should be filled with a flexible caulk, as mentioned above, then covered with fiberglass membrane imbedded in roof coating.  Once that is dry, you may proceed with coating the entire roof, if needed.  Yes, using white will keep your home cooler in the hot season.

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