The 48 hour adventure refers to from just primer to what you see....within 48 hours I shot the bootstripe & masked it, shot the lower hull & masked it, shot the decks & masked them, shot the light grey & masked it, shot the medium grey & masked it, shot the blue and demasked everything. Properly primed and airbrushed acrylics can generally be masked within a couple of hours.
The original color Silly Putty does not leave residue or discolor paint, I don't know about the orange and blue colors Silly Putties. Look for an artcle to be sent to Jeff soon on the technique and it can be used on any type of model.