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
. 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!
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D.