Anyone here ever use that stuff from autozone to patch up a hole in the exhaust pipe? thanks

 

No,
Just get it welded any muffler shop.

 

I've used the bandage on cracked mufflers and the putty to seal leaking joins between pipes & they both work well as a temporary to semi-permanent repair as long as you prepare the surface properly first. Welding does give a stronger & longer lasting repair on metal in good condition however if there's any underlying rust then the weld often won't hold well.

 

Band clamps can work very well-they are several inches long & made to secure two pipes of equal diameter.Then there's the Old School of cutting the ends out of tin cans,slitting the sides,wrapping around the hole & securing with hose clamps.Tennis ball cans worked great,don.t know if they're still steel...