I bought this to repair the sump pan on a 6 hp. Tecumseh engine which had a hairline crack resulting in an oil leak.
I cleaned the area with carburetor cleaner and quickly applied this product , allowed it to sit for a day in sunlight for extra drying and no more leak ! I would highly recommend this to anyone wishing to seal small holes in aluminum alloys or tubing, it works !

I bought this because one of its specified uses is to repair aluminum castings. I used it to repair a cast aluminum differential case on a self propelled concrete saw. It had been backed into something sticking out of the slab and broke a hole the size of a lemon in the casting. I used this product to affix a custom bent piece of 1/8" aluminum plate over the hole and it has been several months now and it doesn't leak a drop of gear oil. Calling it putty is a bit of a stretch as it is too thin for that name. It does set up fast though so you can wait for it to thicken a little.

This ok but expensive

Love this stuff. I got a set of polished aluminum valve covers from the other side of the globe and they had a couple of small voids from the casting. I was able to mix this epoxy on a plate and put it into a pharmacy style syringe for kid's medicine"¦and it worked perfectly.

Works great for my HVAC leak, no more leak.