At least temporarily.
Watched the guys on Mythbusters punch a hole in the radiator.
Then they added a raw egg through the fill area and in 5-7 seconds the leak stopped.

MacGyver did this some 20 years ago

A former brother-in-law had a sure-fire cooling system leak fix, too - half a box of instant mashed potato flakes. Try to guess what happened after the leak stopped. (Hint, arteries aren't the only thing that respond poorly to high starch intake...)

Pepper is suppose to work too on small leaks, but I would have a garage fix any leak I couldn't fix with replacement hoses, clamps, etc.

In the days of the Model T they used oatmeal to stop radiator leaks. That doesn't mean that is is or was a good idea though.

I think you're only supposed to use the white of the egg. Right? Or wrong?

I think you should use the egg AND the oatmeal. And a couple strips of bacon, maybe a cup of coffee... apparently breakfast food is good for radiators.

I think GM coolant tabs are cheaper than a dozen eggs...and I KNOW they work...

Hey,stopping in at a 7-11 or a supermarket for an egg while on the road for an easy quick temporary fix is good to know.
It just may get you home or to a repair shop.

I used some Barr's awhile back, and It seems that I may have finally gotten most of it out of the system. When I finally changed the radiator and other components I noticed that it was all over the thermostat, the radiator cap, and had plugged the overflow line.