This might belong in technical. When I swapped my engine last year, I painted the block, exhaust manifolds, and crossover pipe with ColourPlace High Heat Silver paint. Before painting, they were rust free. Now they seem to be developing a lot of surface rust. What's up with that??

I don't know a lot about this paint, but could it be metal flake in the paint rusting? I am really not happy about this after all of the work I put into it. My next question is how to fix it? I assume sand blasting?

Thanks in advance,
J

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Jay Brintnell
Southern Ontario Fiero Association
Yellow 85 Notchback(A.K.A. GodFearN)

Hey Jay! Long time no see.

This can be caused from a few things, paint prep. (If the paint creates a moisture pocket), dirt underneath the paint, etc , or quite simply the engine is getting too hot for the paint and is just cooking it. I wouldn't exactly trust the "Temps" on the paint, that means the paint won't melt, doesn't mean the paint won't loose adherance and flake off.

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Chase Wakeham,
Concept Fabrications

Hey! It has been a very long time. I am working for a new company now, and never get out to Winnipeg.

I am debating on the best way to clean up this mess. I know one of my manifolds is slightly warped. I may just go to the wreckers for another set, and port them. Maybe I will pull these and try paint stripper first.

Engine swap

POR 15 is the best stuff I have found. Either that or have them ceramic coated. It will help with heat too.

Don't use actual POR 15 on high heat applications. They make 3 high heat products (POR 20, Black Velvet, Factory Manifold Gray) that work great.

I dont use ' high heat ' paint anywhere its recommended and never had any real problem. I do my engines, brake calipers, etc with plain old body paint or spray cans. Id guess you had surface rust before you painted it, or its coming from joints where water can start it peeling and letting more in ie/ heads to block joint. Metallic cant rust in the paint...first its buried in clear and second those fleks are aluminum.

Most likely the problem is the heat capacity of the paint. Alot of high heat paint is really only good for barbeques.

I have found the best of it is caliper paint. But, even then, it won't keep up over the long term in outdoor conditions without re-coating from time to time.

You need paint that is rated to about 1400* and with the expansion and contraction on alot of parts the paint will develop tiny cracks and blister.

Hope this helps a little.

Arn

Thanks all! I'll get to work and see what I can do. I have to put the interior back together first.

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Jay Brintnell
Southern Ontario Fiero Association
Yellow 85 Notchback(A.K.A. GodFearN)