I bought a gallon of PPG Omni (F6 Bright Green) with the intent of spraying my trunk, engine compartment and jambs and maybe saving a couple bucks on my paint job. A paint shop will finish the job using Glasurit. I mixed it 50/50 with omni medium reducer, and the stuff sprays like green water. I figure it will take 3-4 coats to get full coverage. Is this normal or did I do something wrong? I'm certainly no painter.