Welcome to the best acrylics going.
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Do you thin the paint or can you use it straight from the bottle?
What thinner? Can you use water?
For the longest time I didn't thin, but the manufaturer recommends this and it really does work better. Clean tap water works fine. See the article
here under "model color" in the drop down menu for more info.
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How do you stir it? I shook the bottle vigouresly, but that doesn't work with Tamiya either.
Keep shaking and smack the bottle on the heel of your hand. Keep at it. It really will eventually mix. As you use a color more regularly, you won't have to shake quite as much.
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Will it need a base coat or is the adhering quality strong enough to paint straight on plastic/resin? If not which is the best primer?
Most colors will adhere well enough to forego a base, but it's better to prime. I airbrush an appropriate color enamel, light gray, tan, etc. Avoid using glossy as the thinned paint doesn't like this and tends to bead up.
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Will cleaning your airbrush with water be enough, or do I need a cleaner/thinner??
I've never airbrushed this so I don't know. You might want to consider the airbrush line if you're going to be using it.
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Thanks for your help, and any other tips/hints are much appreciated.
Place a drop or two on a non-pourous palette, such as one of those plastic containers condiments come in when you get take out Chinese food. Add an approximately equal amount of water. The paint will stay usable for quite some time, but you may need to stir it periodically during the session. I have blended colors among Vallejo, Andrea, Model Master Acryl, and PollyScale. I don't have any more Tamiya, except for some of their clear colors, so I can't say, but I'd avoid that given how quickly that dries. As you do highlights and shadows, you'll add more water to the mix.
If you get some brush marks from too thick a layer, a thinned layer should even them out.