Graco 390 Paint Sprayer: Complete Guide

Ask a working painter what their first “real” sprayer was, and a lot of them will name the same rig: the Graco 390 paint sprayer. It is the entry point into Graco’s Contractor line — an airless pump that is simple, nearly indestructible, and priced where a serious DIYer or a small crew can justify it. I have run one hard for years, and it still lays a clean fan.

This guide breaks down the Graco 390 paint sprayer specs, tip selection, setup, spraying technique, and the cleanup that actually determines how long the machine lasts.

What the 390 Is — and Isn’t

The 390 is an airless sprayer, meaning it pressurizes paint hydraulically and forces it through a small tip, which atomizes it into a fan without compressed air. That is different from an HVLP unit, which uses a high volume of low-pressure air. Airless is fast and handles thick coatings; it is the standard for painting houses, walls, fences, and cabinets at volume.

The 390 sits at the bottom of the Contractor series. It is built for real work but rated for a moderate duty cycle — think a house or two a year, not a full-time crew spraying every day. For that, you step up to a 490, 590, or a gas rig. But for a homeowner tackling a whole-house repaint or a handyman doing occasional jobs, the 390 is often more machine than they will ever fully use.

Key Specifications

• Max tip size: 0.021 inch — enough for wall paint and most coatings, though not the largest tips heavy stains and blocks demand.
• Max flow rate: about 0.47 gallons per minute.
• Max pressure: 3,300 PSI.
• Recommended annual use: up to roughly 125 gallons per year.
• Hose: ships with 50 feet of 1/4-inch hose; supports longer runs.
• Motor: 5/8 HP universal electric.
• Price: roughly $600 to $750 for the stand model, more for the cart version.

It comes in a stand mount and a hi-boy cart configuration. For anything beyond a small job, spend the extra for the cart — your back will thank you, and the larger cart holds a five-gallon bucket.

Choosing the Right Tip

The spray tip does more to determine your results than anything else. Graco tips use a three-digit number: the first digit doubled is the fan width in inches at 12 inches from the surface, and the last two digits are the orifice size in thousandths of an inch, which controls flow.

• Thin coatings (stains, lacquers, sealers): 0.009 to 0.013 orifice.
• Latex wall and trim paint: 0.015 to 0.019.
• Heavy coatings: 0.017 to 0.021 (the 390’s ceiling).

For example, a 515 tip throws a 10-inch fan with a 0.015 orifice — a good general wall tip. Match orifice to coating thickness and fan width to the surface: wide fans for open walls, narrow fans for trim and detail. Always run reversible (RAC) tips so you can flip and clear a clog without disassembly, and replace tips when the fan starts to distort or tail — worn tips waste paint and ruin finish.

Setup and Priming

1. Place the machine on a stable surface, suction tube in the paint, drain tube in a waste bucket.
2. Set the prime/spray valve to prime and turn the pressure to low.
3. Power on and let it draw paint until it flows cleanly out the drain tube — this pushes air and storage fluid out.
4. Switch the valve to spray and trigger the gun (tip guard on, tip out) into the waste bucket until paint flows steadily.
5. Install the tip, engage the trigger lock when not spraying, and dial pressure up just until the fan fully atomizes with no tails.

Run pressure as low as you can while still getting clean atomization. Excess pressure wastes paint to overspray and wears the pump faster.

Spraying Technique

Airless is unforgiving of bad technique but easy once you internalize a few rules:

• Keep the gun 12 inches from the surface and perpendicular — do not arc your wrist, or the ends get thin.
• Move at a steady pace and trigger just before the pass starts, release just after it ends.
• Overlap each pass by 50 percent for even coverage.
• Back-roll if needed on porous surfaces to work paint in.
• Mask thoroughly — airless overspray travels, so cover everything you are not painting.

Practice on cardboard or a scrap sheet before you hit the real surface. Ten minutes of practice saves a wall.

Cleanup — Where Sprayers Live or Die

More airless pumps are killed by lazy cleanup than by hard use. Dried paint in the pump is a repair bill. After every job:

1. Relieve pressure, remove and clean the tip and guard.
2. Move the suction tube from paint to clean water (for latex) or the appropriate solvent (for oil-based).
3. Run the machine, cycling fluid through until it runs clear out the drain and the gun.
4. Flush the gun, filter, and hose thoroughly.
5. Run Graco Pump Armor (storage fluid) through before storing, especially in freezing weather — it protects the seals and prevents corrosion.

Never leave paint sitting in the pump overnight. Clean it every time and the 390 will run for a decade.

Troubleshooting Common Issues

Airless sprayers have a handful of predictable problems, and most are quick fixes:

• Tails on the fan (the pattern is heavy in the middle, thin at the edges): pressure is too low, or the tip is worn. Bump pressure up; if that doesn’t fix it, replace the tip.
• Sputtering or pulsing: air in the system or a partly clogged intake. Re-prime and check the suction filter.
• Pump won’t build pressure: worn packings or a stuck intake valve. Tap the intake valve gently, or rebuild the pump with a Graco repair kit.
• Tip keeps clogging: unstrained paint. Always strain paint through a mesh bag before spraying, and flip the reversible tip to blow the clog clear.
• Paint leaking at the tip: a worn tip seal or seat — replace the seat kit.

The 390’s saving grace is serviceability: nearly every wear part is a stocked Graco kit, so a $40 to $80 rebuild brings a tired pump back to life instead of a $700 replacement.

Consumables and Running Costs

Beyond the machine, budget for the parts that wear out. Spray tips are consumables — a quality RAC tip runs $15 to $30 and should be swapped when the fan distorts, roughly every 15 to 40 gallons depending on the coating’s abrasiveness (latex wears tips faster than thin stains). Gun filters and pump filters are a few dollars each and should be cleaned or replaced regularly. Keep a bottle of Graco Pump Armor storage fluid on hand for end-of-day flushing and winter storage. These small costs are trivial next to the paint and labor the machine saves, but ignoring them — spraying with a blown tip or a clogged filter — wastes paint and produces a poor finish.

390 vs. the Rest of the Contractor Line

It helps to know where the 390 sits so you buy the right rig. The step up, the Graco 490, adds a slightly higher max tip size (0.021 still, but more flow), a higher annual gallon rating, and the ProConnect quick-change pump that lets you swap the pump in the field in minutes. The 590 and 690 push tip sizes to 0.023 and 0.025 and much higher duty cycles for full-time crews spraying heavy coatings and blocks. The 390 forgoes ProConnect and tops out at a 0.021 tip and about 125 gallons a year, which is exactly why it costs less. For a homeowner or part-time user, none of what the bigger units add is worth the extra money. If you know you will spray weekly, run big tips, or need field pump swaps, start at the 490; otherwise the 390 is the value play.

Getting Good Results as a Beginner

The 390 is easy to run but airless punishes a few beginner mistakes. Keep these in mind on your first jobs:

• Mask more than you think you need. Overspray drifts, so cover windows, fixtures, floors, and anything nearby with plastic and tape.
• Start pressure low and raise it only until the fan atomizes cleanly with no tails — chasing higher pressure wastes paint and wears the pump.
• Keep the gun moving. Pausing mid-pass dumps paint and creates runs. Trigger just before the stroke, release just after.
• Maintain 12 inches and stay perpendicular. Arcing your wrist thins the ends of each pass.
• Practice on cardboard until your pattern is even before you touch the actual surface.

An hour of practice turns the 390 from intimidating into genuinely fast — you will cover a wall in the time a roller does a corner.

Who Should Buy the 390

The Graco 390 paint sprayer is the right tool for a homeowner repainting a whole house, a landlord maintaining rentals, or a handyman doing occasional spray work. It is fast, tough, easy to service, and backed by Graco’s parts availability — you can rebuild the pump with off-the-shelf kits for years. If you spray full-time or need bigger tips for heavy stains and elastomerics, jump to a 490 or higher. But for its price and duty rating, the 390 remains one of the smartest entry points into airless spraying — buy it, respect the cleanup routine, and it will pay for itself in labor saved over rolling.