I paint exclusively with Golden Heavy Body Acrylic Paint. Nothing else gives me the rich, saturated color that I need. I use a 1/2″ Utrecht artificial fiber brush, and I find that Golden Heavy Body cleans up nicely without destroying my brushes. It mixes beautifully to create the vibrant colors I need, and it never clumps or runs. I keep lots of recipes for mixing colors I tend to use often, and I mix batches of those I know I’ll need for a work-in-progress and store them in little glass jars, spritzing them with a little water now and then to keep them workable.
Golden also has great customer service, including a help line that is top notch. They have bailed me out whenever I’ve needed support for technical issues.