The gun provides the level of control you need to do the job correctly. Finished product resulted in clean beads of insulating foam that hardened to a robust seal. Cleanup was easy with the cleaning spray and Teflon coated gun. The extension tubes did not want to stay on, but in the end I didn’t really need them. I used this product and foam board to seal my rim joists. Looking forward to using the gun on a task that is less confining.