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I am new in airbrushing, and generally in painting and a mate suggested me that it is a really good boost to use retarders. I've seen some tuttorials suggesting using some, but when I visited one of my local shops I was asked what I want:
Fluid Retarder
or
Retarder Medium...

I said I will come back, because I have no good knowledge what is what.
Can you help me with this?

Retarder medium is thick, like paint. It slows drying time but doesn't dilute paint.
Liquid retarder thins the paint and slows drying time.

 Buttery Commissar wrote:
Retarder medium is thick, like paint. It slows drying time but doesn't dilute paint.
Liquid retarder thins the paint and slows drying time.

Thanks!
I think I need what dilutes the paint.

I rarely ever use a drying retarder when airbrushing. Some thinners have drying retarder in them already, and so I just use those specific thinners if I need them.

For example, Gunze make "Mr Color Thinner" and "Mr Color Leveling Thinner". The levelling thinner has drying retarder in it already and I find it the perfect combination out of the bottle for Tamiya acrylics, Gunze acrylics and Gunze lacquers.

Humbrol acrylic paint is one that benefits from drying retarders, and Humbrol's own acrylic thinner comes with a healthy dose of drying retarder so you don't really need to add more.

I've never really felt the need to add drying retarder to Vallejo or GW paints, just thinning them with Vallejo Airbrush Thinner is fine.

The only paint I might consider adding drying retarder to is maybe Reaper MSP.

If anything I usually want shorter drying time when I'm airbrushing. So i thin with alcohol.. Vodka.