Hello everyone! 2nd post here
After a few successful attempts with the pbr materials, I was curious to see how 3D coat would cope painting on multiple objects with multiple uv tiles. I started with 6 objects with 28 tiles(it was a bad idea) then reduced them to just two objects with 10 tiles. The biggest hurdle so far was calculating the AO. Baking AO on multiple objects simultaneously took a very long time and produced some bad results. On the other hand, baking individual objects produced better AO maps but I had to import them individually.
The program ran smoothly for the most part, but It would sometimes crash while merging layers. I also noticed that some of the materials assigned to the objects will be replaced by the udim tiles in the "surface material" panel.
Here are some of the textures applied to a glossy shader in Blender. I'm still figuring out what's the best way to make use of the metalness textures and also bring out more of the dust textures.