this pnuematic mixing gun from 3M works well and hasn't gotten a whole lot of use it'll last longer than a autobody technician career with proper handling and use
3M Dynamic Mixing Applicator Gun Pneumatic 05846 Auto body Putty Filler
3M Dynamic Mixing Applicator System Pneumatic Gun 05846
3M DYNAMIC MIXING SYSTEM PNEUMATIC APPLICATOR AUTOBODY FILLER ETC
3M Manual Cartridge Applicator Gun 08571 for Dispensing 200ml Auto Body Adhesive
3M™ Air-powered Applicator Gun, Cavity Gun, 08997
