Quick question. I am pc'ing an old Mopar cast iron intake for a customer. I have done a few smaller cast iron pieces before. Degrease, brake cleaner, wipe down, sand blast, outgas, allow to cool to around 150 degrees, coat, cure. I did this same process today on the intake as I've done before, but during outgassing in the oven it flash rusted (bad). It turned completly brown. I am wondering is this normal for cast iron? I don't remember the smaller pieces doing this, or maybe I just didn't notice, they were test pieces. I didn't feel good about coating the intake after seeing the rust so I guess I'll re-blast it tomorrow and go again. Any help would be appreciated.
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Flash rust on cast iron
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