We probably need some more info to diagnose your issues.

1) What did you thin the Tamiya paint with? Air pressure? What airbrush is it?

2) The nature of airbrushed paint is that it is an extremely thin layer. Which means it will be less durable than some brushed finishes. That said, it also takes awhile to fully cure, even after it visually appears dry. Were you actually trying to scrape it, or accidental, or ???

3) If you do some sanding, as long as you blend the sanding into the area already painted, when you respray, you shouldn't have any problems.

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We probably need some more info to diagnose your issues.

1) What did you thin the Tamiya paint with? Air pressure? What airbrush is it?

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Airbrush is the Paasche H model single action.

I used (based on recommendation of hobby shop guys that the Tamiya thinner is nasty stuff) the Testors universal thinner.

Air pressure was around 30lbs (too much?)

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2) The nature of airbrushed paint is that it is an extremely thin layer. Which means it will be less durable than some brushed finishes. That said, it also takes awhile to fully cure, even after it visually appears dry. Were you actually trying to scrape it, or accidental, or ???

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Both, actually. I'll take a look and test out today since it's been nearly 24 hours. I tried it after just an hour or so.

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3) If you do some sanding, as long as you blend the sanding into the area already painted, when you respray, you shouldn't have any problems.

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What's best practice to "blend" then? Just using super fine sandpaper?

Thanks!

Yeah. I responded to your other thread about sanding. What grit are you using? I find that even 400 is typically fine enough to blend into other stuff, although you may want to do a final sanding with 600 or so. Just my experience.

The kit could have had excessive mold release, oils from your hands, etc. This is where cleaning the kit before painting, or putting down a primer will help.