What is a good roof sealer for flat roofs that hold ponding water?

or:What is a good roof sealer for flat roofs that hold ponding water?or:Go to the building supply store and get their advice. It depends on what the

or:What is a good roof sealer for flat roofs that hold ponding water?

or:Go to the building supply store and get their advice. It depends on what the roof is made of.

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