This caulking gun won't even fit through a tube of cartridge. About halfway through, the gun rod stopped extruding sealant. If you inflate the pen far enough then some sealant will come out, but of course you won't be able to glue a line that straight. I can't tell if it's just really bad design or if I just got a bad example. In any case, I was lucky to find out about this before 30 days had passed. Thank you Amazon for your return policy!
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