Re: Stripping paint off an aluminum intake
Strip it then blast it the rest of the way. I've run a few like this and they did fine. Gas is what usually stains it and oil comes from whatever at the time.
I've always used simple green BBQ cleaner under the hood and it picks all the oils up and is nice to the paint under. Then just low pressure rinse everything off.
As for painting or clear coat, unless you know any that are gas proof and heat and oil proof it can be a bad idea actually. Regular upkeep will keep white rust away
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