Having gone through the various stage of masking with Blu-Tack and spraying a separate colour for the camo I have finally finished the basic pattern...
I have to say it didn't seem to be entirely successful, as you can tell from the photo there are clearly visible marks around the edges of the pattern where one paint layer joins the other. This hard edged effect isn't as clean as I was hoping it would be and now I will have to do a fair amount of remedial touching up.
Of course this can be partially explained by the fact that I am using spray aerosol cans instead of an airbrush as I am guessing that an airbrush can put down a finer layer of pain, thus negating any noticeable borders between paint patterns.
I can't help but be a little disappointed and have to wonder if I might have done a better job by just brush painting the camo?
Certainly these more subtle paint effects do seem to be best done with an airbrush, but I don't want to buy one of these until I can afford a very good quality one. I shall try a couple more experiments with this Blu-Tack masking technique on some spare plastic packaging to see if altering the hard mask to a softer one can alleviate the noticeable lines between colours.