600055 - SIKKENS Autosurfacer Optima Gray Primer - 3L KO DRAFT

• Type : 2K Primer – Sanding versions (with sanding) and Non Sanding versions (without sanding)
• Colors : White, Gray, Dark Gray (mixable in 5 Quick-Mix gray shades)
• Hardeners : Autosurfacer Optima Hardener Sanding / Hardener Non Sanding
• Thinners (activators) : Reducer Sanding Fast, Medium, Slow / Reducer Non Sanding Medium, Slow
• Drying at 20 °C (Sanding) : sandable in ~30–60 min depending on thickness and thinner
• Forced drying : 60 °C ≈ 10 min (without prior evaporation) – IR ≈ 5 min (max 100 °C at the element)
• Without sanding : evaporation 15 min at 20 °C · recoatable up to 24 h at 20 °C
• Target thickness : Sanding ≈ 45–50 µm /coat (≈120–130 µm in full cycle) · Non Sanding ≈ 25–30 µm (1 coat)
• Indicative pot-life : Sanding (Fast/Medium) ≈ 30 min at 20 °C · Sanding (Slow) ≈ 30 min at 30 °C · Non Sanding (Medium) ≈ 35–45 min at 20 °C · Non Sanding (Slow) ≈ 60 min at 30 °C
• Substrates : steel and aluminum (direct metal), OEM e-coat (degreased/sanded), old paints, polyester fillers, plastics primed with suitable adhesion promoter
• Finish compatibility : Sikkens Autowave / Autowave 2.0 / Autobase Plus / Autocryl Plus / Autocryl Plus LV
• EU VOC : Cat. IIB.c – ready to use ≤ 540 g/L

Mixing Ratios

With sanding (Sanding)

• Volume ratio : 3 Autosurfacer Optima : 1 Hardener Sanding : 1 Reducer Sanding (Fast/Medium/Slow)
• Mixing order : add hardener first and stir, then thinner and stir again
• Gray shades : White / Gray / Dark Gray mixable (Quick-Mix table)

Without sanding (Non Sanding)

• Volume ratio : 3 Autosurfacer Optima : 1 Hardener Non Sanding : 2 Reducer Non Sanding (Medium/Slow)
• Mixing order : same sequence as above

Application

Surface preparation

• Degrease then final dry sanding: metal ≈ P320 · finishing areas P500 (P600 recommended on dark shades)
• Avoid any contact of exposed primer with water (e.g. water-dilutable degreaser)
• Plastics: pre-treat/sand/clean + suitable adhesion promoter

Spray gun settings (gravity feed)

• Sanding : nozzle 1.6–1.8 mm · 1.7–2.0 bar air cap pressure · HVLP 8–10 psi at nozzle
• Non Sanding : nozzle 1.2–1.4 mm · 1.7–2.0 bar air inlet pressure · HVLP 0.6–0.7 bar (8–10 psi) at nozzle

Application process

• Sanding – spot repair : 1 thin closed coat (wait until matte ~1–3 min) + 1–2 full coats without intermediate evaporation
• Sanding – full panel : 1 thin closed coat (wait until matte ~1–3 min) + 2 full wet coats without evaporation
• Non Sanding : 1 full coat sprayed over the entire area

Scuffing & sanding

• Sanding : by hand P400 (exception S8.06.02) · finish P500/P600
• Non Sanding : minor defects: dry P800 or wet P1000 (if > 24 h, careful sanding required)

Workshop benefits

• Ultra-short cycles (air, 60 °C or IR) for maximum productivity
• Flexible application: sandable / non-sandable versions according to workflow
• Very good anti-corrosion resistance (direct metal application possible in Sanding/Non Sanding*)
• Smooth finish enhancing the appearance of bases and clears

*For heavily bare surfaces, prefer pre-treatment (Autoprep wipes or Washprimer 1K CF) before primer.

Safety & storage

• Use appropriate PPE: gloves, goggles, and air-supplied respirator
• Store closed at ~20 °C, protected from extreme temperatures – shelf life 12 months (all variants)
• Equipment cleaning: Sikkens solvents / Guncleaner cleaners

About

Designed for demanding bodyshops, Autosurfacer Optima reduces downtime and limits rework thanks to fast sanding and stable application.

Its broad compatibility (bare metal, e-coat, primed plastics) and Sanding / Non Sanding versions make it a benchmark 2K primer for IR and 60 °C baking processes.

Ideal in combination with Sikkens Autowave, Autobase Plus, and Autocryl finishing systems for reproducible and durable results.

Non-contractual photo

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