GREAT ITEM, I HAD AN EXHAUST LEAK ON MY NEWMAR MOTORHOME WITH THE BIG V10 ENGINE ON THE PASSENGER SIDE THE EXHAUST GASKET WAS MISSING AT THE TOP CORNERS AT BOTH ENDS, INSTEAD OF MESSING WITH BREAKING OFF EXHAUST BOLTS LIKE ON ANY ENGINE, I JUST TOOK MY DREMEL TOOL WITH A WIRE BRUSH ATTACHMENT CLEANED IT ALL UP AND THEN TOOK MY AIR COMPRESSOR AND BLEW AWAY ANY RESIDUE FROM THE CLEANING OF THE EXHAUST MANIFOLD THEN I OPENED UP THE QUICKSTEEL PRODUCT AND STIRRED UP THE CONTENTS WITH A SCREW DRIVER, THEN APPLIED IT TO THE AREAS MISSING THE EXHAUST GASKET, THEN LET IT DRY FULL OVER NIGHT THEN THE NEXT MORING I STARTED UP THE ENGINE ANS "WOW" LIKE BRAND NEW SOUND NO LEAKS WHAT SO EVER!! EASY TO APPLY THE WHOLE JOB TOOK ME UNDER 30 MINUTES TO GET IT ALL CLEANED AND APPLIED.. VERY EASY TO WORK WITH.. AMAZNG PRODUCT.. HIGHLY RECOMMEND TO ANY ONE WHO HAS A SIMILAR SITUATION LIKE MINE THE STUFF REALLY WORKS....

Used this to fix an exhaust manifold and so far it has worked great. Have to follow the instructions to get it to work perfectly.

Worked well on repairing the weld cracks at the collector of my header. Has held up now for a couple months.

Doesn't work whatsoever. Followed directions to a T and it doesn't last more than 20 mins before coming apart. Tried to plug a small crack in header pipe and even after several layers fully cured didn't last 20min.

I think the issue with Quiksteel/Thermosteel is how challenging it is to use, and the lack of good instructions in the box. I imagine if you absolutely nailed the method, you'd have something that is virtually as tough as steel. I say this because I used it to cover a very long hairline crack in my exhaust manifold, and in some areas I managed to apply it really well, but in others it was more difficult to get it nicely into place. And as a result, it covered parts of the crack, but not all. The places where it broke open (dried out and crumbled) were the places where I couldn't get the application just right.

I have no idea what advice to give for the timing and proper mixing of Thermosteel. My only advice is to let it cure a good long while, and then warm it up slowly. Turn your car on for a few minutes, then let it sit for a while. Repeat. I think if you carefully stir it up well, apply it evenly (and relatively quickly) to a sanded off surface, and give it a crazy long time to cure and very slowly/methodically heat it up, you could have an extremely powerful tool here. I think the manufacturer needs to have a nice long laundry list of tips to improve your odds of success.