Oh Doogs I'm sorry see that Play-doh disaster, did you manage to recover the kit or not? It's a pity as well because the edge that's left on the camo looks great.
Blu Tack is the way I'll be going on my Spit because all the RAAF Mk.VCs were repainted from their original RAF colors, so a slightly soft edge camo should be fine.
This is my Hase Mi.VIII from a few years back that was masked with Blu Tack and it turned out ok, so I'll tempt fate and use the same technique again.