Anest Iwata WS-Primer(Filler)1.8 Primer Gun
The WS-PRIMER Filler is a dedicated spray gun from Anest Iwata, purpose-built for high-build primer (filler) applications. It’s engineered to handle thick, high-viscosity primer materials with precision, giving a high-quality, even lay-down while minimizing overuse of material and reducing the effort needed for sanding.
Key Features & Benefits
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Split Nozzle™ Technology
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The gun uses Iwata’s Split Nozzle™ System, which channels airflow through three separate slots.
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This design improves atomisation even at lower pressures, producing their signature flat-oval fan pattern — ideal for consistent coverage and reduced material waste.
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Self-Adjusting Needle Packing
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The needle packing is designed to auto-adjust, which removes the guesswork when setting it up. Just tighten, and it calibrates itself.
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This feature also helps reduce maintenance time and ensures a reliable seal.
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Durable Air Valve Seat
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The air valve seat is made from aluminium and sealed with a solvent-resistant O-ring, making it robust and long lasting.
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This “bullet-proof” design resists over-tightening and holds up well to frequent use.
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Optimised for Filler / High-Build Primer
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Specifically configured to apply high-build fillers: this version is not just for thin surfacers but for “filler application.”
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Helps achieve flat, even material lay-down, which leads to smoother surfaces and less effort sanding after cure.
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According to Iwata: fewer abrasives are needed (less sanding) — saving on consumables.
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Ergonomic & Maintenance-Friendly Design
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Ergonomically shaped handle and trigger for painter comfort.
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Easy to disassemble / clean: the manual provides clear steps for disassembling the air cap, fluid nozzle and needle.
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Designed to minimize downtime during cleaning and part replacement.
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Identification / Visual Cues
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The filler version has distinctive black adjusters and air cap, which differentiates it from other WS-PRIMER variants (such as Wet-on-Wet).
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Air / Pressure Specs (per filler-model data)
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Recommended working pressure: 2.0 bar (≈ 29 psi)
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Air consumption: ~ 370 Nl/min for the filler version.
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Gravity-feed design: cup feeds material from the top.
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