object paint not working on a linked fbx

[Dave Buckley]

i'm hoping to use the object paint tools on the side of a building that i have file linked from revit. it turns out i can't.

 

it paints over everything else except that building.

 

so i thought, well let's bind it, still nothing.

 

after binding the revit file it just remains as a 'mesh' object which means nothing to me

 

so i try to convert one of these 'mesh' objects to editable poly and i get a horrible triangulated mesh but my object paint works

 

btw i linked and combined by material which is probably why the convert to editable poly works horribly as all of my walls are one object due to all having the same material