I cant understand why my mesh isnt imported correctly into SP. In Blender it looks fine, but the SP, I can see the backside of my object isnt punched out like it should be.
Can you attach the mesh file
Sorry it took so long - I've been away most of the day.
The problem is with those ngon faces and you can fix this easily in Blender.
Open the Blender file, Select the object and choose Edit mode.
Select the four, front and back ngon faces
Go to menu Face > Triangulate Faces
Then export the model as fbx (there is no need to unwrap again)
It should now work fine with Painter