This is not my original idea, credit is due to Ryan Townsend at Berserk Custom Paint
The question comes up every now and then about how to duplicate welds on the surface of a model. While watching this video for a customer's project it hit me that this technique could be used to duplicate weld beads on a model. Just by reducing the size of the applicator used to lay the weld beads, the rest could either be done by airbrush or carefully layed down with a paintbrush.
Watch it and see what you think, haven't tried it yet but it looks like it could work with a little practice.
http://m.youtube.com/watch?v=PTTILRcMtlw