I have been working on a couple of aircraft models and have lately run into some serious problems. Here's the setup:
Airbrush: Badger 250
Compressor setting: (a utility compressor with reservoir), pressure setting 30-40 psi
Paint: Model Master Acryl thinned to "the consistency of milk" with MM Acryl thinner.
Model Prep: washed with warm, soapy water prior to assembly (just OOB & while still on sprue). After assembly and just prior to paint, wearing latex gloves, I wipe the model down with a lint-free cloth and rubbing alcohol--let dry for 30 min to 1 hr in front of a fan, then wipe down with a dry, lint-free cloth.
On one model, I used a spray can primer (MM Enamel primer gray), let dry for 2+ weeks.
I paint the model with the base color, then let dry for 2+ days. Mask with the low-tack 3M painter's tape (purple stuff) and/or 3M Post-It notes. Paint my second color, let dry for 15 minutes, then remove the masking.
PROBLEM: On one model (Lindberg's 1/72 H-3), the paint (under the masking adhesive) peeled in only one 1" section--all the way down to the primer. On the other model (DML 1/48 Me-163 Komet), under ALL the masking adhesive, the base color paint peeled off all the way down to the plastic.
What did I do wrong? Any help, suggestions or advice would be greatly appreciated!
NOTE: This technique has been succesful for me on 30 other model airplanes and only 1 other time, did I peel a 1/8" section of paint (but that was my mistake).