# POLYURETHANE COATING (N-TYPE) RAINBOW PAINTS ## Product Codes No.726 / No.728 / No.728-1 / No.728-2 / No.728-3 / No.745 ## Type Two-component topcoat formulated with acrylic polyol resin, hardener and weather-resistant anti-corrosion pigments. ## Application Top finish for metal parts, wood furniture, FRP plastic profiles. ## Properties 1. High gloss, smooth flat film surface 2. Excellent outdoor weather resistance, no yellowing / fading over long-term exposure 3. Powerful resistance to acid, alkali, oil and various chemical solvents 4. Hard, flexible film with excellent adhesion and abrasion resistance ## Specification Data - Gloss: Flat - Color: Custom assorted colors - Flash Point: Above 20°C (68°F) - Specific Gravity: ≥1.1 kg/L (mixed paint, varies by shade) - Viscosity: 60~85 KU (25°C) - Drying Time - Tack-free: Within 1 hour (25°C) - Hard dry: Within 6 hours (25°C) - Full cure: 7 days - Film Thickness: Wet film 70~110 μm, Dry film 30~50 μm - Theoretical Coverage: 9.0 m²/L, 8.2 m²/kg (@50μm dry film) - Recoating Interval: Minimum 6 hours (25°C) - Volume Solids: 45% (mixed paint) - Mix Ratio: Base : Hardener = 85 : 15 by weight (as printed on bucket) - Pot Life: 8 hours at 25°C - Thinner: No.1005 Rainbow Thinner - Thinner Dosage: 5~10% by weight ## Compatible Primers Full series Rainbow primers, No.1011 Inorganic Zinc Primer ## Compatible Topcoats: Polyurethane finish, chlorinated rubber finish, ULI finish ## Storage Stability: Minimum 3 years under normal storage ## Application Methods Brush Coating, Air Spray, Roller Coating ## Construction Precautions ⚠️ 1. Mix base and hardener evenly per specified ratio, stand 10~20 minutes for reaction before use. 2. Fully remove grease, sludge, dust, rust and corrosive salts from substrate surfaces. 3. Avoid construction when temperature below 10°C or relative humidity exceeds 85%RH; fully dry damp surfaces before coating. 4. Clean all coating equipment immediately after use. 5. Maintain full ventilation during confined tank interior construction. ## Note All datasheet data are internal laboratory test results for construction reference only. Actual performance varies subject to different service environments. This document does not constitute legal warranty of the manufacturer. Contact Rainbow technical department for clarification of any uncertainties.