So this problem is incredibly annoying to say the least, and has resulted in me having to take the resultant png diffuse map into photoshop and remove the misplaced colors. It seems like the colors on the edge of one UV Cluster are bleeding/transferring to the edges of another UV Cluster. Is this a bug or is there something I can do to fix this? I just want to be able to paint along the edges normally, but it doesn't seem to want to do that. Here is a picture showing the problem: