JB Weld

Tue May 09, 2006 1:17 pm

Anyone have experience with JB Weld at high temperatures? Ineed to fix a crack on an aluminum block lawn mower, so it's only air cooled.

Re: JB Weld

Tue May 09, 2006 2:34 pm

sviennadan wrote:Anyone have experience with JB Weld at high temperatures? Ineed to fix a crack on an aluminum block lawn mower, so it's only air cooled.


It's been a long time since I made such a repair, but I think JB Weld will resist any temperature below what the lubricating oil can resist. Maybe the difference is very slight, but you should be good to go.

Tue May 09, 2006 2:36 pm

When you see suspicious smoke, back off!

Wed May 10, 2006 9:46 am

I used it to seal the top of my radiator and it held up fine for a year at which point I had it recored.

Billy

Thu May 11, 2006 4:56 am

My experiences with JB Weld have ALL been positive :wink: I have found that the bonding works far better when cracks are properly CLEANED and free of any dirt or grease. I use brake cleaner on the surfaces to clean them.

I use a DREMEL fine rotary bit to enlarge the crack slightly, and get a NEW, clean surface to work with.

Mixing EQUAL amounts is extremely important for a lasting bond. So if you squeeze out two equally looking lines of JB Weld (close to, but not touching each other)...you can cut them BOTH (at either end) with a single edge razor blade and discard any excess BEFORE you mix them together. :wink:

Thu May 11, 2006 7:26 pm

I've never tried it myself, but they claim you cna use JB Weld to install valve seats.