If you are doing rust repair patches on your restoration project, I put together a few tips for you on how to avoid blowing holes through your seams: Use short bursts, pull the gun away from the work a bit to make a cooler weld, don't point the gun directly at the weld, hold it at an angle, weld on the last weld, that's the thickest piece of metal, use a copper backing plate to prevent fall out. Follow me on social media. Facebook - ****** Twitter - ****** Instagram am - ******