How to transfer Tamiya paint

Why would you want to change bottles? 

You may find with dropper bottles the paint is harder to mix. The shape and the inability to see inside the dropper bottle makes it difficult to determine if the paint is throughly mixed. To avoid problems I typical spend 3-4 times longer shaking vallejo dropper bottles vs stirring tamiya with a metal mixer.

If you are still wanting to change bottles i would transfer paint with cheap pipettes and ensure the bottles are airtight as tamiya paints tend to evaporate faster than most acrylics.

I am not keen on the dropper bottles, i find they always clog up. Most of the time i take the dropper oiff and take out what i need with a paint brush. Tamiya paint is rather thick so would make this work.

So, to echo BlackSheep, why would you want to.

If you're using the acrylic glass jars I find them easiest of any for decanting into the airbrush. I'm assuming that's what you mean? 

All you need is a stir stick or similar held against the rim of the glass as you pour and it channels the paint into your airbrush cup then a quick wipe of the glass rim before recapping is all that's needed there. 

Tamiya bottles have an excellent plastic seal that keeps it airtight. They are also excellent for stirring the paint.

I have some Tamiya paints that are almost 8 years old and are fresh as the first day I got them. With that said, why fix something that's not broken?

The eye dropper bottles like Vallejos may be more convenient to use but as mentioned, do clog up and make mixing/stirring a bit more involved.

Wait... you want to thin your paints ahead of time in the new jars to be airbrush ready? You don't want to do that.

But do what you want - your paint, your money. None of us transfer paint to another bottle for the sake ease in your argument. A waste of time IMO.....

No, I would thin what i need, as I need it, so i don't have to worry about opening the tamiya container. I have 50 containers so I don't need too buy any more

GA

No big deal opening the bottle to get what you need then closing it up. Make sure you wipe off any paint from the threads and the top of the bottle lip and your paints should last a long time.

As I previously stated, I have some Tamiya paints that are 8+ years old and are fresh. I have some enamel paints by Testors and Humbrol being 15 to 20 years old and are still good. Just wipe the threads, lip and inside of the cap and your paints will last longer.