Hi Pickers, thanks for the reply. I tried the retopo room trick but when I go back to the UV room, there is still sharp edges. Also, the paint room uvs now don't match the retopo room uvs.
I don't use or need the retopo room and these extra steps and hoops to clear sharp edges in the UV room seems like a workflow regression in a package that deals with uv mapping.
Older versions didn't place sharp edges automatically on importing from blender.
It was the great uv room unwrapping that made me pick 3dcoat over substance painter as it reduced workflow steps. Now I am unwrapping in blender again so the advantage of 3dcoat over substance is gone.
Basically, the UV room just needs a delete sharp option. Or at least let the edge loop ignore the sharp edges so I don't have to select hundreds of edges one by one when making seams.
Sorry for the rant.