elastomeric compositions of discrete parts of curable polymer and a curing agent are converted , by means of a portable , hand held conversion and dispensing apparatus , to a curable mass . the apparatus in a single compact package includes means for receiving the uncured composition or article breaking or fragmenting the composition conveying the fragmented composition to a mixing zone mixing the curable composition and discharging or dispensing the mixed curable material into or on a substrate for in situ curing thereat . also included is a power source and power transmission means wherein different rotational speeds and directions are obtained between the conveying and mixing means .