Here is a bit more on the texturing...
Elliot: I move back and forth between 3DPainter and Photoshop:
1.Enter projection paint, and pick up the surface color>export the projection canvas>then reject Projection paint.
2. Now open the projection canvas in Photoshop>paint>save.
3. Return to 3DPainter, switch to the bitmap tool>load bitmap (choose the same file you exported [the projection canvas].
4. Click in the viewport to drop the bitmap>right-click, choose fit to view>then right-click, Apply.
5. Save modified textures.