1970 Swinger 340 Hemi Orange 4 speed

Picked up the paint supplies for the bottom of the car today. I got two quarts of UNO acrylic eurothane low gloss black. It's made by BASF and is supposed to be really durable automotive industrial paint. (4:1:1) I also picked up a pint of acrylic enamel Hemi Orange for the overspray underneath (8:1:4) I was going to use the basecoat glasurit Hemi Orange that I already have for the body but the overspray wouldn't be as durable and would be flat without clearing it. I also have a gallon of Resto Rick undercoating for the wheelwells.. It's gonna be hard making a messy look under the car after all this work!