by Malcolm
Hmm tricky... it wouldnt give u the same affect but perhaps something similar... try getting some plastic mesh, and wrapeing it aroudn the area your painting... and use it like a stencil... once our finished, you can take it off and join up the block sections.
It may or may not work, but let me know it goes. Im curious.
Or if u had the paitence you could fine something square ended and dot in each square. But due to the nature of paint, it may end up still looking a little round.
There is a process called colour eze, which allows you to make custom ink transfers, similar to letracet (text transfers), its a long and drawin out and rather dificult application. but it allows you to computer generate and transfer custom transfers. with detail no finer than a millimeter think, it would also need a clear coat to prevent from being rubbed off. This could possibly work, if you had the paitence. but you still need the materials, which are hard to come by.