I tried both air powered and battery powered goo guns but neither were any use with Sikaflex, its just too thick! Nothing like strong wrists for Sikaflex I found:eek: . Couple of years ago we (son and daughter helped out) reskinned the entire coachbuilt body of our then motorhome and glued the new ali skin on with about a dozen tubes of Sika 221, Christ on a bike that made our wrists hurt!:eek: !

D.