Clutch replacement, was not expecting this

[North Idaho Wolfman]

A soda blaster would be really good at cleaning that up and then, Ospho, then paint.
Also replace the throw-out bearing and pilot bearing/bushing while your in there!

 

[jaxs]

I loathe when this happens since it's difficult to resolve without leaving hard feelings. I've never left metal exposed after treating with Ospho unless metal was primed and painted after treatment so I can't say from experience that Ospho won't protect metal. However I can speak from experience with other acid converters. My experience has been that metal is better left untreated until you can follow up shortly with primer and paint. I suggest those contemplating use of Ospho or any other converter without priming and top coating do an experiment first. Wire brush a piece of rusty scrap then treat 1/2 while leaving other half untreated. I plan doing the experiment with Ospho and hope I find it does protect when left without top coating. It would be very handy to spot treat random items then top coat over the next year or two as I'm using top coats that match items.

 

[BastropMetal]

A soda blaster would be really good at cleaning that up and then, Ospho, then paint.
Also replace the throw-out bearing and pilot bearing/bushing while your in there!

Perhaps I'm overthinking this, but what type of paint should I use?

Just to help me understand better, why is it important to paint in there? If I get rid of all the rust and I also resolve the issue with moisture getting in there, would it still continue to rust?

 

[D2Cat]

I have cleaned rusted metal with a wire brush to get all loose particles removed. Then coat with Ospho, let it dry and never coat it with paint. It dries to a hardened black coat. The rougher the rust the better it works.

I sprayed a mist on a friend's old Ford PU that had a patch of rust on the hood from an overheated engine. He left it that way until it went to the scrapper and the dried coating actually looked pretty good. Ospho does provide a good undercoat if you decide to paint. Their instructions actually indicate no primer needed.