Air cleaners typically have the thinnest of black paint on anything under the hood. They were very thin coats at best and when I have blasted them it is similar to blowing old dust off of something. In other words it takes no effort whatsoever and a standard lid will generally take me about 2 minutes to blow the paint off of both sides. Never have I found primer on any engine parts. Most of them were dipped in lacquer and not sprayed. The air cleaner being one exception. The dipped parts take a little more effort but there is still no primer on them.
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