Please recommend GOLDEN products I can use for marbling and to keep my paint fluid so I can get the blending time. I know about the glazes, but they can be thick.
You may wish to try creating your own glaze mixtures if you think the GOLDEN premade glaze colors are too thick for how you want to work. Start with the GOLDEN Acrylic Glazing Liquid and add either GOLDEN Airbrush Medium or Airbrush Transparent Extender until you think the consistency is better for how you want to work. Add the GOLDEN Fluid Acrylics or new Matte Fluid Acrylics to the glaze mix. Typically a good starting point is 10 parts Glaze base to 1 part color.