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Form a gasket WB brake booster to firewall

Hi All

Anyone know what the gasket material is on a WB brake booster to firewall?
What do you use?

Just removed my brake booster and there is a black maluable substance between the booster and firewall, it has the consistence of blue tack, once removed easily you can squish into a ball.

Thanks in advance.

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Comments

factory i think its called black mastic?? no idea where you would get it.

i redid mine just with plain old windscreen sealer, same with the heater box.

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Selleys. Bunnings.

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steve..
O.H.T.C. Original Member.
My Shed

Thanks Steve. You nailed it.

Butyl Mastic product from sellers available at bunning and othe independents .....
http://www.selleys.c...

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