Make sure you mix them well .

You might need to stir them since shaking may not be enough .

Are you using an airbrush ?

If so ,

I'd recommend the Tamiya acrylics or the AK Real Colors  , they are both " lacquer acrylics "

The type of acrylic resin used in the paint determines the type of vehicle used and the type of thinners ( reducers ) that are compatible .

The " lacquer acrylics " can be thinned with alcohols and conventional lacquer thinners that you are familiar with that contain alcohol , acetone , butanol etc .

Acrylic resins that are not listed as " lacquer " will gum up if exposed to alcohols and ketones .

There are many , many different hobby paints available today and people have their preference like everything else .

The " water base " acrylics are generally preferred for brush application .  -- but can of course be applied via airbrush .

Tamiya ---> https://www.scalehobbyist.com/catagories/Paint_and_Construction/browse.php?s=3&t=1&u=1&pg=1&ppp=48&sb=stocknumber_a&so=d&man=TAM

AK Real Colors --- > https://www.scalehobbyist.com/catagories/Paint_and_Construction/browse.php?s=3&t=1&u=1&micr=4104&pg=1&ppp=48&sb=stocknumber_a&so=d&man=AKI

There are also many sets for specific subjects available  :  https://www.scalehobbyist.com/catagories/Paint_and_Construction/browse.php?s=3&t=1&u=2&pg=1&ppp=48&sb=stocknumber_a&so=d&p=1