I have used JB weld previously but this was my first time using the high temp version . I used it on 2 small and one larger hole on a silencer ,unlike so many other similar products ,this does not fall through the hole you are trying to seal ,dries quickly and was sanded down smooth 24 hrs later . A very good way to seal holes or cracks without resorting to a traditional weld where applying such heat via a weld is not practical