So I have another mod problem. This one is quite unique as I have never seen it before. The problem is ever since I changed the .cs file on the GM skin that I made from the one with the black trim to the one without trim. @Glitchy was able to make the problem less severe but it is still there. There is chrome splotches and "ghost lettering" all over the car. Old: New: (there is less in this one but you can still see some)
Flippi, I removed "colorPaletteMap[2] = "vehicles/fullsize/HNLpopo/HNLpopo.dds"; and the skin works fine. You're issue lies there. FYI - I downloaded the HNLpopoold.zip. You likely have a similar problem in the other one.
It's only for skins that would use multiple color channels and it requires a special skin file for it. The diffuse/overlay map would be the same pretty much.