I agree, Omni use to cover good, but lately it seems that they are using more fillers, and it takes more to cover. The 4th Dimension is so thin it would take 2to3 gallons to paint a car ,especially if is transparent. Good paint is not cheap,but will save you a lot of time.You leave out a lot of info. Single Stage (SS) or BC/CC. Is your color a solid or metallic? Are you going down to bare metal? If so are you going to use an epoxy primer? Will you use a primer surfacer next to get the surface level? I use PPG myself. The only difference between Omni MP170 and Deltron DPLF40 epoxy is the window for top coating. Three days vs. 7 days. Omni has a great primer surfacer MP282 which is just as good as the higher priced Deltron. However, Omni paint can be thin on the pigment side so it might take more coats for solid coverage. So I use Deltron Concept SS for color since it covers better and the UV inhibitors are better. I'm pretty sure when it comes to the base coat version of Omni vs. Deltron 2000 the Deltron would cover much better. Although PPG says they have updated the Omni line but whether they mean the products or just the marketing image I don't currently know.