Painting walls using a spray gun (spray gun) is a method that saves time, provides uniform coverage and allows even a beginner to achieve a professional result. However, without proper preparation and knowledge of the technology, the process can result in stains, smudges or uneven color. In this article we will look at all about painting walls with a spray gun: from choosing equipment to finishing, as well as cutting secrets of the masters, which are rarely mentioned in standard instructions.

Why a spray gun? Firstly, it is 2-3 times faster than a roller or brush. Secondly, it can be used to paint relief surfaces (for example, decorative plaster) without gaps. Thirdly, the layer is applied thinner, which reduces paint consumption by 10–15%. But for these advantages to manifest themselves, you need to take into account dozens of nuances - from paint viscosity to the trajectory of hand movement. Next you will find step by step instructions with visual diagrams, material compatibility tables and answers to frequently asked questions.

1. Choosing a spray gun: which spray gun is suitable for walls

Not every spray gun can handle painting walls. For example, mini spray guns for furniture or cars (with a 100–200 ml tank) quickly overheat with large volumes, and pneumatic models require a compressor and pressure setting. Three types of equipment are optimal for walls:

  • 🔹 Electric airless (for example, Wagner W 550 or Bosch PFS 5000 E) - easy to use, suitable for water-based and acrylic paints. The pressure is created by a pump, not compressed air, so there is no “fog” when spraying.
  • 🔹 Pneumatic HVLP (for example, DeVilbiss FLG-4) - professional models with high paint transfer (up to 65%). They require a compressor, but give a perfectly even coating.
  • 🔹 Hand pumps (for example, Krause & Becker 1000) - a budget option for small spaces. Suitable only for liquid paints (viscosity up to 50 DIN).

Key parameters when choosing:

  • 📌 Performance: for walls you need a model with flow rate 200–300 ml/min. Less - you will paint for too long, more - it’s difficult to control the layer.
  • 📌 Torch adjustment: look for models with the ability to change the width of the jet (optimally - 10–30 cm). A narrow torch is useful for corners and baseboards.
  • 📌 Tank material: plastic ones are cheaper, but metal ones (aluminum or stainless steel) last longer and do not react with solvents.
⚠️ Attention: If you paint texture wallpaper or decorative plaster, avoid models with too high pressure (more than 2.5 bar). They “press” the paint into the recesses, causing the relief to be lost.
Spray gun type Suitable paints Pros Cons
Electric airless Water-based, acrylic, latex Lightweight, no fog, suitable for beginners Does not cope with thick paints (oil, enamels)
Pneumatic HVLP Any (including oil and alkyd) Ideal coating quality, saving paint Expensive, requires a compressor, difficult to set up
Hand pump Liquid water-based, lime Cheap, autonomous Low productivity, hands get tired quickly
📊 What spray bottle do you use for painting?
Electric airless
Pneumatic HVLP
Hand pump
Haven't tried it yet
Other

2. Preparing the walls: why 80% of success depends on this stage

Even the most expensive spray gun will not save you if the walls are poorly prepared. The main mistake beginners make is ignoring priming and puttying of “minor” defects. When sprayed, the paint does not hide, but rather emphasizes, unevenness, so preparation must be more thorough than when working with a roller.

Step-by-step algorithm:

  1. Surface cleaning: Remove old paint, wallpaper or plaster. To do this, use a spatula, construction hair dryer (for thermal removal) or special removers (for example, Docker S4). Be sure to dust the walls with a vacuum cleaner - even microparticles will create a “shagreen” when sprayed.
  2. Alignment: Fill cracks and dents. For a spray gun, it is critical that differences in plane do not exceed 1–2 mm. Use a finishing putty (eg Knauf Rotband Finish) and sanding mesh with grain P120–P150.
  3. Primer: Apply 1-2 coats of deep penetration primer (e.g. Ceresit CT 17). This will reduce the absorption of the wall and prevent the paint from drying unevenly. For porous surfaces (aerated concrete, plaster), use primer with quartz sand - it creates roughness for better adhesion.

Pay special attention camouflage: Cover baseboards, sockets, switches and windows with masking tape. For a spray bottle, it is better to use tape as wide as 5 cm - narrow (2–3 cm) may allow paint to pass through due to “fog”. Stick it also protective film on the floor and furniture, even if they stand 2-3 meters from the wall - small drops scatter further than it seems.

Remove old coating (paint, wallpaper, plaster)|

Fill cracks and potholes|

Sand the surface (grit P120–P150)|

Apply 1-2 coats of primer|

Cover all unpainted elements with masking tape|

Cover the floor and furniture with protective film|

Check the humidity of the walls (no more than 8%) | -->

⚠️ Attention: If the walls have previously been painted oil paint or enamel, they need to be completely removed or processed adhesion primer (for example, Betokontakt). Otherwise, the new paint will peel off.

3. Paint preparation: viscosity, filtration and test spray

Spray paint should be less viscousthan for a roller. The optimal viscosity depends on the type of spray gun:

  • 🔹 Electric airless: 20–30 DIN (the consistency is like liquid sour cream).
  • 🔹 Pneumatic HVLP: 15–25 DIN (closer to milk).
  • 🔹 Hand pumps: 10–20 DIN (almost like water).

How to achieve the desired viscosity:

  1. Thin the paint distilled water (for water-based) or solvent (for alkyd/oil based ones). Add liquid in small portions (according to 50–100 ml per 1 liter of paint), stirring constantly.
  2. Check viscosity viscometer (costs ~300 rubles) or the “folk” method: the paint should drain from the stick behind 20–30 seconds (for HVLP) or 30–40 seconds (for airless models).
  3. Filter the paint through nylon stocking or special filter (for example, Sata 100 µm). This will remove any lumps that may clog the nozzle.

Test Spray - a mandatory step! Apply paint to cardboard or drywallto:

  • 🎯 Check the uniformity of the torch (should be in the shape of an oval without “tails”).
  • 🎯 Adjust the pressure (for pneumatic models: 1.5–2.5 bar).
  • 🎯 Make sure that the paint does not form smudges (if it does, increase the distance to the wall or reduce the paint supply).
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If the paint is dusty (forms a fine suspension), add 1–2% drying retardant (for example, Tikkurila Teho). This will reduce fog and improve flow.

4. Painting technique: how to hold the spray gun and move

The most common mistake is wrong trajectory. When painting with a roller, we are used to moving up and down, but with a spray gun this leads to an uneven layer. Professionals use "band overlap" method:

  1. Hold the spray bottle perpendicular to the wall at a distance 20–30 cm. Tilt angle - 90°. If you tilt the nozzle, the spray will become asymmetrical and streaks will appear.
  2. Drive in parallel horizontal stripes, overlapping each previous one by 30–50%. Movement speed - 30–50 cm/sec (much like writing with a marker on a board).
  3. Start and end outside the wall (in the area protected by film). This will prevent paint from pooling at the beginning/end of the strip.

Movement pattern for right-handers (for left-handers - mirrored):

→→→→→→→→→→→→→→→→→→→→


←←←←←←←←←←←←←←←←←←←← (overlap 30–50%)


→→→→→→→→→→→→→→→→→→→→

For corners and baseboards:

  • 🔸 Use narrow torch (adjustment on the spray gun).
  • 🔸 Move from top to bottomholding the nozzle at an angle 45° to the junction of the walls.
  • 🔸 For the ceiling: point the torch parallel to the floor, and not perpendicular (otherwise the drops will fall down).
How to paint walls with texture (for example, "bark beetle")

For textured surfaces, use spray gun with a wide torch (30–40 cm) and increase the distance to the wall to 30–40 cm. Move slower than on a smooth wall (speed ~20 cm/sec) so that the paint has time to fill the recesses. For best effect, apply the first layer thinned paint (viscosity 15–20 DIN), and the second – standard (20–25 DIN).

⚠️ Attention: Do not try to “paint over” the gaps right away - wait until the layer dries (usually 2–4 hours) and apply the second one. Otherwise, thickenings will form in these places, which will be visible in side lighting.

5. Common mistakes and how to avoid them

Even experienced painters sometimes encounter defects when spray painting. Here are the most common problems and their solutions:

Problem Reason How to fix
Smudges Too thick paint, slow movement, close distance to the wall Thin the paint, increase the speed of movement, move 5–10 cm
"Fog" (small droplets around) High pressure, wrong solvent Reduce pressure to 1.5–2 bar, add drying retardant
Striping Uneven overlap of stripes, unregulated torch Increase overlap to 50%, check flame symmetry
The paint is dusty Paint too thin, low pressure Add 5–10% paint without dilution, increase pressure by 0.2–0.3 bar

A few more non-obvious mistakes:

  • 🚫 Using ordinary water for dilution: it contains salts, which appear as white streaks after drying. Always use distilled water.
  • 🚫 Painting at temperatures below +10°C: the paint thickens and flows poorly. Optimal range - +18…+25°C.
  • 🚫 Working in direct sunlight: The paint dries too quickly, causing microcracks. Cover windows with curtains or paint in cloudy weather.
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The most common reason for failure is haste. Don't try to paint the wall in one pass. It is better to apply 2-3 thin coats at intervals of 2-4 hours than one thick coat that will bleed.

6. Caring for the spray gun after use

If you do not clean the spray gun immediately after painting, the nozzle and needle will become clogged with dried paint, and the O-rings will lose their elasticity. Step by step cleaning:

  1. Drain off any remaining paint from the tank to the container. Do not pour it down the sink - acrylic and alkyd paints will clog pipes.
  2. Rinse the tank solvent (for water-based ones - water, for oil-based ones - white spirit or solvent).
  3. Clean the nozzle:
    • Remove the needle and nozzle (according to the instructions for the model).
    • Immerse them in the solvent for 10-15 minutes.
    • Clean out soft brush (for example, dental) or blow with compressed air.
  • Lubricate the seals silicone grease (for example, WD-40 Specialist) so that they don't dry out.

    • For long-term storage:

    • 🔧 Wrap the spray gun in oily rag (so that metal parts do not rust).
    • 🔧 Store in dry place at temperature +5…+30°C.
    • 🔧 Once every 3 months, check the seals for cracks and replace if necessary.
    ⚠️ Attention: Never use for cleaning metal objects (needles, wire) - they scratch the nozzle, which leads to uneven spray. For stubborn stains, use ultrasonic bath (available in service centers).

    7. Advice from professionals: life hacks for perfect results

    Experienced painters share secrets that are rarely found in instructions:

    • 💡 For smooth walls: Apply a coat before painting primer-paint (for example, Tikkurila Luja). It fills micropores and reduces finishing paint consumption by 20%.
    • 💡 For dark colors: Paint the wall first gray or white base paint (for example, Dulux Supermatt). This will reduce the number of base color coats from 3-4 to 1-2.
    • 💡 For large rooms: use extension rod for a spray gun (for example, Wagner Teleskop). It allows you to paint the ceiling and top of the wall without a stepladder.
    • 💡 To save paint: Adjust the torch so that its edges are slightly blurred. This will reduce lane overlap and reduce consumption by 10-15%.

    How to check paint quality:

    • 🔦 Light up the wall oblique light (for example, a flashlight at an angle of 30°). All defects (stripes, omissions, shagreen) will be visible.
    • 🔦 Look at the wall through polarized glasses (for example, for drivers). They enhance contrast and reveal irregularities.
    💡

    If the paint lays down with “shagreen” (fine texture), add 1–2% to it paint conditioner (for example, Floetrol). It evens out surface tension and makes the layer smooth.

    FAQ: Answers to frequently asked questions

    Is it possible to spray paint on wallpaper?

    Yes, but only by non-woven or vinyl wallpaper for painting. Paper wallpaper may peel off from moisture. Before painting:

    1. Dust the wallpaper with a vacuum cleaner.
    2. Apply a layer acrylic primer (for example, Caparol Tiefgrund).
    3. Use water-based paint with viscosity 20–25 DIN.

    Do not spray paint embossed wallpaper (for example, with embossing) - the paint will fill the indentations and the design will disappear.

    How many layers of paint need to be applied?

    It depends on:

    • 🔹 Wall colors: if you repaint a dark wall light - 3-4 layers.
    • 🔹 Type of paint: acrylic and latex usually require 2 layers, oil ones - 1-2.
    • 🔹 Quality of preparation: if the wall is primed, 2 layers are enough, if not, 3.

    Wait between layers 2–4 hours (see instructions on the can). Apply the last layer perpendicular to the previous one for uniformity.

    How to avoid streaks when painting?

    Divorces appear due to:

    • 🔸 Uneven hand movement (too fast/too slow).
    • 🔸 Incorrect distance to the wall (should be 20–30 cm).
    • 🔸 Too thick paint (check viscosity with viscometer).

    To avoid divorces:

    1. Practice on the cardboard until the movement becomes smooth.
    2. Use masking tape for marking stripes (this makes it easier to control the overlap).
    3. Add to paint antisilicone (for example, Sniezka Anti-Silikon) - it prevents the formation of streaks.
    Is it possible to spray paint in an apartment without a respirator?

    No! When sprayed, it forms fine suspension, which penetrates the lungs. Minimum protection set:

    • 😷 Respirator with filter A2P2 (protects against organic vapors and dust).
    • 👓 Glasses with side protection (paint can ricochet off walls).
    • 🧤 Nitrile gloves (acrylic and alkyd paints corrode the skin).

    Also provide ventilation: Open windows and use an exhaust fan. If you paint oil paint, work in gas mask - its vapors are toxic.

    Which spray gun is best for painting walls in the house?

    Ideal for home use electric airless spray gun (for example, Wagner W 690 or Black & Decker HVLP1200). Benefits:

    • 🔹 Does not require a compressor.
    • 🔹Easy to adjust pressure and torch.
    • 🔹 Suitable for water-based and acrylic paints (the most popular for walls).

    If your budget is limited, take hand pump (for example, Krause & Becker 1000), but be prepared for longer work and lower quality.