I use a compressor with tank, that feeds into an auxiliary six gallon tank. Water trap installed at exit of second tank. When full pressure of 125 psi is reached I turn off compressor, then wait until system is down to about 30 psi before turning compressor back on.
That gives me a long time of spraying available. Refill to full pressure takes about 110 seconds, the twin compressor cylinders stay quite cool that way, zero tendency to get hot, which helps prevent water in system. Always drain both tanks at end of session anyway.
Patrick