For powder coating that is a very good compressor. But you mention that you will want to use some automotive tools with it so I can tell you right now that its way underpowered. With 4.5 CFM @ 90PSI you could probobly run a small die grinder okay, anything else and its going to choke on you.
If you're actually thinking of using some auto air tools my advice is to get a bigger compressor.
etyrrany
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