The same thing came to my mind; isn't your model grouped by any chance? If so, just "enter" the group (double click) until you get to the individual faces and only paint those.
Or attach a model (paste a link to where it1s uploaded) for us to see what1s going on.
I Made This All on my own the house I made seperatly from everything else. I did the same thing with the chicken coop. Then I imported them into the farm. So then I moved all the stuff around abit to make it all fit just like my own farm. Then saved it all then painted it all so it looked pretty close to the real thing.
