Some things are just too tight to try to spray into. I used Rustoleum rust transformer. Neutralizes and transforms rust to metal. It's in a small plastic bottle. I use a small brush to allow it to flow/drip/run into tight crevices like parts of a hood. It goes on whitish and turns black when dry. Works well. I once painted the rusty tail pipe on my 46 Willys Jeep and it stayed balck and rust free for over 10 years until I sold it.
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