I have a old cast iron pulley for my air compressor with some pretty deep rust pits in the sides of the "V", and I'm concerned that a belt will not last very long or it may slip.

Don't want to remachine it because that would change the size of it, and there's not a lot of extra to play with.

So I plan to sand blast the inside really good to both finish cleaning it and give some tooth for something to stick to it.

The question is what do I use to repair it/fill in the rust pits? Something like JB weld, or?? I was planning on some "magnum steel" that I've had one the shelf for 5 or 10 years, but it's rock hard and in the trash now..
So now that I have to order something or make a trip to the store what do I need to find, and where do I find it?

Then I'll chuck it in the lathe to clean up the extra and just skim and true the surfaces.

Thanks,
Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-