This information represents the availability and pricing of AeroGel insulating blanket material, a promising candidate for high-temperature applications, in particular, the engine compartment of the fire-prone GMC coach.
I don't think it is practical for cab insulation due to the high cost.
It isn't cheap, to be sure, but neither is replacing your coach after an overfilled transmission pumps that extra fluid through the vent onto your hot exhaust headers. A cheap alternative is a well-plumbed transmission vent line, with or without optional reservoir. Cheaper still, just make sure you know how much fluid is too much.
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