Hi Trixx, Just in case you didn't know in the preferences menu in decimation master setting you just have to select preserve polypaint and after decimation you will keep all the polypainting. Generally 20% will keep the topology fine and retain enough detail on the polypaint.
I'm back with another question! I was wondering if its possible to export my subtools as one .obj with vertex colors intact. I've tried using Decimation Master to export all of my subtools as one .obj, but it doesn't preserve any vertex color information like the Subtool Master. I also tried exporting each seperate subtool…
Never mind guys! I found the solution. I had layer recording turned on in my subtools, and that was causing the polypaint to be destroyed when I merged all of the subtools. So to anyone that finds this, make sure to turn off layer recording, merge all your subtools, export as one .obj, and all the vertex color information…