BS06-2 Acrylic Polyurethane Intermediate Coating

Overview
Two-component acrylic polyurethane intermediate coating for steel substrates where intercoat adhesion, sandability, and weatherable film build are required.
Performance focus: fast drying, hardness, adhesion between layers, sandability, and resistance to solvents and chemicals.

Composition
Part A: acrylic resin with pigments, fillers, and additives.
Part B: polyisocyanate curing agent.

Typical uses
Intermediate coating for automobiles, construction machinery, mining machinery, ships, bridges, and steel structures.

Technical data (typical)

• Color: various colors.

• Theoretical consumption: 0.13 kg/m² at 40 µm DFT (loss not included).

• Drying time (25℃): surface dry ≤1 h; hard dry ≤8 h; full cure 7 d.

Application data (25°C)

• Mixing ratio (Part A:Part B): 16:4.

• Induction time: 5 min.

• Pot life: 4 h.

• Application methods: airless spray, brush.

• Thinner: dedicated thinner, 2–8% (higher for air spray/roller).

• Recoat interval: min 8 h; max 7 d.

• Recommended coats/DFT: 1 coat 40–60 µm; brush/roller 1 coat 35–50 µm.

• Recommended system: acrylic polyurethane primer + acrylic polyurethane intermediate coating + acrylic polyurethane enamel coating.

• Application conditions: RH ≤85%; 5–35℃; avoid rain/snow, strong wind (>6.7 m/s), heavy fog, intense sunlight.

Surface preparation
Over primer: primer surface free of oil and dust; do not exceed maximum recoat interval; roughen if exceeded.
As first primer: blast-clean to Sa 2.5 or power-tool clean to St 3; surface profile 30–75 µm.

System compatibility / packing / storage

• Compatibility: used between acrylic polyurethane primer and acrylic polyurethane enamel coating.

• Packing: Part A 16 kg; Part B 4 kg.

• Storage: warehouse dry and ventilated; keep away from fire and heat sources; no outdoor stacking; shelf life 12 months.