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A mixture producing a slurry for coating metallic vehicle exhaust conduits utilizing a refractory cement and a caustic or alkaline salt binder. Sufficient amounts of water are also employed in the slurry resulting in a flowable material. The slurry flows over and hardens as a thin uniform coating on

A mixture producing a slurry for coating metallic vehicle exhaust conduits utilizing a refractory cement and a caustic or alkaline salt binder. Sufficient amounts of water are also employed in the slurry resulting in a flowable material. The slurry flows over and hardens as a thin uniform coating on the interior surface of an exhaust conduit. The coating exhibits excellent adhesion to the metallic material, does not crack or chip under impact forces, and possesses a coefficient of thermal expansion similar to the underlying metallic structure.

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A slurry forming a stable coating on metallic vehicle exhaust conduits during heating and cooling of the conduits, consisting essentially of: a. a thermosetting alumino-silicate refractory cement ranging from 30 to 80 percent by weight; b. an alkali metasilicate salt binder ranging from 2 to 10 perc

A slurry forming a stable coating on metallic vehicle exhaust conduits during heating and cooling of the conduits, consisting essentially of: a. a thermosetting alumino-silicate refractory cement ranging from 30 to 80 percent by weight; b. an alkali metasilicate salt binder ranging from 2 to 10 percent by weight; and c. a sufficient amount of water to produce a flowable material when combined with said refractory cement and alkali salt binder.