It always seemed to me that it was the red dye they use in the red/purple/orange plastic that was a major problem (sometimes). Since orange is about 1/2 red, and purple is about 1/2 red, I just wouldn't ever expect much of a problem with orange bleeding into purple.

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ORANGE PLASTIC BLEED: Monogram '69 Judge--somebody here shot Tamiya Silver Leaf? Real Silver? said it worked *NM*
- I've never done it myself but have seen silver, also aluminium mentioned as "sealers" over red & other shades of plastic. *NM*
- What color are you trying to paint it? *NM*
  - Splash Paints Verdoro Green Poly over their Dark Grey Surfacer *NM*
    - I'm thinking between the dark gray primer and Verdoro Green, it should work out *NM*
      - Same here. *NM*
- The few times I did it, I used platinum gray Duplicolor with a quick blast of "sealer primer" on top of that. I try to avoid kits molded in red/orange/yellow and look for another issue in white or gray *NM*
- Depends on the final color, really. I would try the mild 'standby' automotive primers first like Plastikote T-235 as close to the finish color as you can get
- Orange plastic AMT '40 Ford, sanded, sprayed an older version of Krylon flat silver, then Krylon purple, no bleed through *NM*
  - Would you even notice orange bleed thru into purple? Usually if the base/paint are kind of the same color, you won't have trouble. *NM*
    - Earth tones (orange, red, brown, probably yellow) tend to overpower other colors. The purple might work though, depending on how dark it is *NM*
      - It always seemed to me that it was the red dye they use in the red/purple/orange plastic that was a major problem (sometimes). Since orange is about 1/2 red, and purple is about 1/2 red, I just wouldn't ever expect much of a problem with orange bleeding into purple.