>>281630933
>>281630826
Someone else mentioned it but I'm seconding the Mr. Color Aqueous paints. They're fully compatible with Tamiya paints and the Mr. Color line seems to have a nicer selection of colors for GKs. Mr. Levelling Thinner tends to be the go-to recommendation for both of these when airbrushing, which probably won't work out for you since it's a lacquer thinner, but you can use the normal acrylic thinners you otherwise would mixed with a bit of the Tamiya paint retarder or Mr. Retarder to achieve the same effect as the Mr. Levelling Thinner.