Renner 641 Pigmented Primer — 1K/2K

✅ Ideal For:

• Finishers looking for a tintable waterborne primer that can now be pigmented to match the color of your topcoat — saving time and improving color uniformity.

• General-purpose interior wood finishing on all wood species and MDF.

• MDF items and closed-pore systems needing strong hiding and insulation.

• Shops that want 1K ease with the option to catalyze (2K) for tougher stain blocking on tannin-heavy woods like oak and ash.

💙 Why Finishers Love It:

• New tintable formula: unlike older primers, YL M641 can be pigmented with Renner colorants to achieve the same base tone as your topcoat — ideal for achieving perfect coverage and color depth.

• High hiding & insulating power for fast, even coverage.

• Flexible workflow: use straight from the can or catalyze 2–10% with YC M404 for extra durability.

• Excellent sandability and great vertical hold up to 180 µm (~7 mils wet).

• Low odor, low VOC, and easy cleanup with water.

🎨 Finish Options:

• M641/NTR Neutral (tintable base)

• Compatible as a primer under waterborne interior topcoats

🧪 Product Specs:

• Type: Waterborne basecoat, 1K/2K (ready-to-use or catalyze 5–10%)

• Solids: 50 ± 2 %

• Density (23 °C / 73.4 °F):

  • NTR Neutral: 1.250 g/cm³ (10.4 lb/gal)

• Viscosity (DIN 8, 23 °C / 73.4 °F):

  • NTR: 30 ± 8 s

• pH: 7–9

• Recommended Coats: 1–3

• Per-Coat Application Weight: 150–220 g/m² → ~115–176 µm wet (≈ 5–7 mils wet)

• Spreading Rate: 6–10 m²/L → ~244.5–407.5 ft²/gal

• Max Vertical Hold: 180 µm wet → ~7 mils wet

• Drying @ 20 °C (68.0 °F), 45–65% RH, ~160 g/m²:

  • Dust-free: ~30 min

  • Touch-dry: ~60 min

  • Recoat: ~4 h

  • Sandable: ~4 h

  • Stackable: ~8 h

• Forced Cycle (guide): Flash-off 30 °C (86.0 °F) / 10 min → Forced air 45 °C (113.0 °F) / 45 min → Cooling 25 °C (77.0 °F) / 5 min; sandable may be reduced to ~2 h depending on build and conditions.

🛠 Spray Equipment Guide:

• Methods: Conventional, Airmix, Airless, Electrostatic (equipment must be suitable for waterborne)

• Conventional:

  • Thinning: ~4–6 % water

  • Nozzle: 2.0–2.2 mm

  • Atomizing Air: 3–4 bar (≈ 43.5–58.0 psi)

• Airmix:

  • Tip: 0.011 in (≈ 0.28 mm)

  • Assist Air: 0–2 bar (≈ 0–29.0 psi)

  • Fluid Pressure: 80–110 bar (≈ 1160.3–1595.4 psi)

• Airless:

  • Tip: 0.011 in (≈ 0.28 mm)

  • Fluid Pressure: 120–150 bar (≈ 1740.5–2175.6 psi)

• Pro tips: Pre-atomizers/pre-heaters (product 30–40 °C / 86.0–104.0 °F) help consistency; avoid heavy wet-on-wet passes; ventilate booths to renew full air volume every 15–20 min.

🌡 Handling & Storage:

• Application temp (product, substrate, environment): ≥ 15 °C (59.0 °F)

• Shelf life: 18 months when stored between 5–35 °C (41.0–95.0 °F)

• Cleanup: Water immediately after use; for dried film, soak with AY M460 overnight, then rinse with water

• Waste: Dispose of booth water/washings per local regs; do not discharge to sewer

• Substrate prep: Clean; for MDF, use sharp tools and sand to P220–P240 to minimize fiber raise

• Tannin/extractive woods: For oak/acacia/ash, use ≥ 4% YC M404 hardener in the primer to reduce staining