Automotive finishes will give you a more level surface if everything else is equal. The equipment enamel is a heavier based material and won't lay as flat due to the higher viscosity so you will most likely see some "texture" or very light orange peel. One advantage of any enamel is that the final coat is normally a self glossing finish, no rubbing needed. I have used the PPG line of acrylic urethane and am very pleased with the ease of applying it. Temperature AND humidity will play a big part of any material. If I were going through all of the prep work, I would use automotive finishes, I don't care for the "thick" appearance of heavy enamels and over-applied repaints.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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