Directly from Peel and Seal's installation instructions

"Service Temperature -25° - 200° F"

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http://www.mfmbp.com/purchase/store/tabid/81/ProdID/2/Peel_and_Seal.aspx

I call BS on the drips. Someone might be using something they are calling Peel and Seal, but it's probably not it.

Dynamat says

"Dynamat is a patented, lightweight elastomeric butyl and aluminum constrained-layer vibration damper. Dynamat conforms and fuses easily to sheet metal and other hard substrates. Material performance is optimized for temperature ranges between 14°F and 140°F (- 10°C to +60°C). Material can withstand temperature extremes between -65°F and +300°F (-54°C to +149°C) and is highly resistant to aging."

Looks like their service temp is 14F to 140F, peel and seal doesn't list a maximum temperature though, not that I can find anyway.

I seriously doubt someone's car gets any hotter than someone's roof, especially with peel and seal on the inside of the car.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.