Each product has its own procedure for applying and its own thinner/reducer/hardener/activator whichever is appropriate for the type of material. What was the advertised gloss of the OMNI interior paint, was it supposed to be high gloss or a matt finish?

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