I'm fond of the Sherwin Williams Genesis line, which like Imron is used on commercial trucks quite often. It's a single stage polyurethane, that is easy to spray and lays down quite well. Very durable.
Used on My Valiant, Dads Valiant, and Darren's Dakota.

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"Livin' in a powder keg and givin' off sparks" 4 Street cars, 5 Race engines