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You can thin vallejo matt with water or medium. Viscosity and pressure are inversely proportional. Higher viscosity = less pressure. Less viscosity = higher pressure.
Udo wrote: You can thin vallejo matt with water or medium. Viscosity and pressure are inversely proportional. Higher viscosity = less pressure. Less viscosity = higher pressure.
You have that the wrong way round, viscosity is a measure of thickness rather than thinness. High viscosity = thick, low viscosity = thin, so a low viscosity paint is one which flows very easily and thus only needs low pressure.
Increasing pressure to compensate for high viscosity has the problem of introducing too much air in to the paint and also though you might clog less, when you do actually get a clog it'll be harder to clear.
Generally the way to compensate for a higher viscosity is to use a larger nozzle size so that you aren't trying to force thick paint through a tiny orifice, but it's usually harder to swap the nozzle than it is to just crank up the pressure
