| Which is better, I mean goes on good and has a very flat finish, the Polly scale flat or Tamiya's XF 21 and future? |
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Either one works fine. Using PollyScale (or another premixed clear flat) will be more consistent from one day to the next since you don't need to mix it each time and worry about the exact proportions. Mixing XF-21 and Future gives you the luxury of choosing the level of sheen that you want; some places dead flat, others just semi-gloss. You don't have to stick with just one, use them both as the situation warrants.
Future and XF-21 does tend to have a slight whitish tint as it approaches dead flat whereas PollyScale doesn't. This becomes more apparent with higher proportions of XF-21.
PollyScale cleans up with just plain old water. Future needs something with ammonia in it to clean properly. That might be an issue to you as well.
As to the original topic of this thread, I have to agree with Tom. Testors Dullcote has been known to cause a lot of problems with paints and even with some decals if you aren't careful. I used it once many years ago and ruined a paint job. Personally I'll never use it again and these days stick with acrylic flat clear.