Paint Sprayer Spitting or Spraying Unevenly? Fixes (2027)

Check the supply first: a suction tube tip above the paint line in a low can, a cup running empty mid-pass, or a liner wrinkled and trapping air all starve the gun and cause spitting. Refill or tilt the can so the tube stays submerged, reseat the liner flat, refill the cup, and re-prime per the manual before touching any setting. A gun that spits at the end of every pass is usually describing an empty supply, not a faulty sprayer.

HVLP guns especially need paint thinned gradually, stirred well and strained through a paint strainer before pouring, with a test spray on scrap to confirm a smooth coat. Unstrained paint carries lumps that clog tips and nozzles, and unthinned latex lands textured, the classic orange-peel look. Thin in small steps, retest after each step, and use the viscosity cup where one is included; thinning too far causes runs, so patience beats a heavy pour of water.

A clogged tip sputters and fans unevenly; a worn tip fans wider with heavy edges and a weak centre long before it looks damaged. For a clog, reverse a reversible airless tip and clear it per the manual, or clean an HVLP nozzle and needle thoroughly with water or the coating's solvent. For a fan that stays uneven after cleaning, replace the tip: tips are consumables, and a fresh tip is cheaper than a recoat.

Too little pressure starves the fan, too much pressure bounces paint back and creates overspray, and both look like a sprayer problem. Set pressure to the coating and tip guidance, hold the gun at the maker's recommended distance, move at a steady speed with a 50 percent overlap on each pass, and trigger off the workpiece at the end of each pass rather than arcing. Arcing the wrist at pass ends is the most common technique cause of thin edges and heavy centres.

Patchy exterior passes usually mean the wrong tip size for the coating, a pump at its flow ceiling, or wind carrying the fan off target: step to the correct tip within the pump's ceiling, slow the pass, and wait for calm conditions outdoors. A coat that will not level indoors usually means the coating went on too thin, too cold or over a dusty surface: clean and lightly scuff the surface, warm the space into the coating's range, and lay a fuller wet pass rather than dusting on more thin coats.