Painted my first car a couple weeks ago. The owner bought the cheapest single stage the paint shop had, Nason Urethane. After shooting we did a light scuff with 1200 to let it gas off for a week. Went back and did a couple passes on a panel with 1500 and the primer underneath is starting to show through. Was told that that paint is very transparent cause its cheap. Thought I had loaded it up but apparently not enough. Ultimately I am going to reshoot the car instead of going through the whole process of wet sanding to 2000 only to find out there's not enough material to buff. My question is, do I go back on with the same material n just load it up more, or should we go out and buy a better quality single stage that will have more coverage? Havin fun but we want this thing back on the road!