I'm a panel beater with over 20 years in the trade. Nothing wrong with your method of repair great job. But using that air chisel without ear muffs and using a mig welder without a full welding helmet is crazy. I'm 62 years old now with hearing aids from industrial deafness. Wish someone gave me a hard time about not wearing ear muffs.Wow!!! It's rare to find such talented people who know everything about what they are doing.