REMA TIP TOP Vulcanizing Compounds are uniquely designed for cosmetic repair to tire and conveyor-belt surfaces - not for use where cord damage exists. When thoroughly mixed in equal portions, these materials chemically cure at room temperature producing a durable, permanent repair. Vulcanizing compounds are limited to bead repair of truck/OTR tires or sidewall repair of OTR tires only. CFC-free formula requires shorter drying times. REMA TIP TOP's Vulcanizing Compound has no equal when it comes to cold vulcanization injury filling. Equal quantities of A compound and B compound, thoroughly mixed, produce a durable permanent repair. This kit includes one 650 gram can of compound A, one 650 gram can of compound B and a 225 gram can of Special Blue Cement which is CFC free.