This paint sprayer could be useful for both big and small projects. You get great flexibility since it runs on a battery and lacks a cord that can restrict your movements.
From Amazon
WAGNER battery-powered Paint Sprayer W 600 FLEXiO (Battery and charger are not included in the scope of delivery) for dispersion/latex paints, varnishes & glazes, container 1300 ml + 800 ml
Conrad Electronic
Wagner UniversalSprayer W600 Flexio Cordless paint spray gun 18 V Max. feed rate 500 ml/min