Just looking for some help on masking - trying to mask the top half of a wagon (in white) so I can paint the bottom in black, but, despite having some good tape, (Modellers STUK Professional) I'm struggling to make it stick due to a lack of surface area. Also, what's the best way to do it ? edge first and then the mask area?(paper ?) or mask area short of edge and overlap with another strip up to the boarder ?