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Should I anticipate any problems with doing this?

I made the mistake of buying some Tamiya paints (for normal brush work, not airbrushing) and I can't deal with the super-fast drying time. I considered picking up a bottle of retarder, but at the end of the day it might just make more sense to switch back to the Citadel products I'm already comfortable using.

However, I've already basecoated one of the models I'm working on with the Tamiya. If worse comes to worse I can strip it, but I'd rather just transition into Citadel colours. Will I be ok, or could the different paint formulas interact in a destructive way?

It will be fine. They are both acrylic formulas and can be mixed if you want to.

I used Tamiya quite a bit before switching over to Vallejo. You can definitely paint over Tamiya with Citadel no problem, but you won't get very good results if you were to actually mix the two brands together to make a different color, shade, highlight, etc. because Tamiya is alcohol based (hence the fast dry time), and Citadel is water based.

Tamiya make both enamels and acrylics, which one do you have?

If it's acrylics, they'll work fine. You have to be a tiny bit careful painting Tamiya over another acrylic because it's alcohol based and will soften the underlying paint. Not a huge problem if your'e careful, but something of which to be aware.

I really like Tamiya acrylics, I find they go on smoother than most of the other non-alcohol based acrylics.

I wasn't aware they had enamels! Tamiya acrylics are fantastic if you know how to control them (fast dry time). They've had the greatest finishes in my experience.