How To Fix A Door Gap On A Car - Automotive Paint And Body Tech Tips. Using the right tools to do the job can always get you farther on a car repair. here My Friend Pete shows us how to use a cutoff wheel and a mig welder to repair body line gaps on old and new cars and trucks. It's an Automobile Restoration Lesson you DON"T WANT TO MISS! #MyFriendPete #DiyAutoSchool #SWRNC http://www.swrnc.com or 972-420-1293