Thinning varnish

[homechild]

Quick question for you all.
I have AK Interactive and Vallejo varnish (matt, satin, gloss) and wondered what I should thin them with and to what ratio.
Any ideas?

[KarlW]

You can cut them with water, but not too much, own brand thinners work better.
Ratio depends on what you're doing with them and how thin they are already.

[homechild]

Plan on airbrushing aircraft with them (I have older/cheap/rubbish airbrushes that I’ve used in the past, I just can’t remember the ratio.
One of them mentions water but doesn’t say how much. I’ll see how thin it is and apply some common sense.
Thanks