Girl Jean deck planking and simulated pitch caulking.

I've used this method once before to simulate the pitch on the plank joins but was in too much of a hurry to incorporate it into my other builds.
Ingredients -
                  Planks
                  Black sugar paper
                  Fast setting wood glue (Loctite woodbond rapid)
Cut a piece of sugar paper to suit the planks you intend to use.  (I used approx A4 for my planks.)
Put some pva onto a non porous surface.
Drag the edge of the planks lightly across the pva.  
Lay the plank edges onto the sugar paper approx 2mm apart and press down.
Once dry, trim the sugar paper along the edges of the planks.
You will have a plank with one black edge and they look pretty damn good when laid.