RE: dope question
Airbrushing:
ALWAYS have good ventilation when spraying Dope. Its mean stuff if you inhale the fumes. Its meaner to inhale the mist. This stuff can kill you if you spray in an enclosed space. It is also an explosion hazard in confined spaces.
Thin with either the SAME brand thinneras the dope... or Acetone. don't mix brands of dope... they sometimes congeal to the consitency of cottage cheeze when mixing different brands. (one heck of a mess...)
1) the dope MUST be thinned to airbrush. Usually 50-50. Thicker dopes may need MORE thinner. (Pactra Fokker Red needs about 40% thinner, 60% dope... its already thin. The thinnest color I have ever found, and its consistent.)
2) Mask off well using automotive "Fine Line" masking tape for the edge of the area to be sprayed and blue masking tape over the rest. If you don't want the new color on it... cover it.
3) one LIGHT coat of clear is sprayed at the edges to seal the tape to the old color. (clear may bleed... but you will never see it.)
4) spray the new color.