These model air paints are designed o be used directly in an airbrush without the need of thinning etc. While this is what they advertise I initially struggled getting them to work right and really thought these suck. After much trial and error I found that some conditions apply. You need to use at least an 0.5mm nozzle/needle set up and also kick up the compressor psi...once I did that I found that these paints work great and I love using them. If you can meet those requirements I highly recommend these paints.