# WATER-BASED ACRYLIC ELASTOMERIC COATING RAINBOW PAINTS ## Product Code No.421 ## Type Water-based elastic exterior topcoat refined from weather & alkali resistant waterborne elastic acrylic resin, matched with durable pigments and functional fillers. ## Application Protective & decorative finish coat for concrete building facades. ## Properties 1. High elasticity: The coating film remains intact without cracking to achieve waterproof leakage prevention when micro-cracks appear on cement walls 2. Outstanding weather resistance and anti-chalking performance 3. Excellent water & alkali resistance with low water permeability 4. Elongation rate at 250μm dry film thickness: 300% for gloss, 200% for semi-gloss, 100% for matte finish ## Specification Data - Gloss: Gloss ≥60% - Color: White, light shades (varies by color) - Specific Gravity: ≥1.15 kg/L - Viscosity: 100~140 KU (25°C) - Drying Time - Surface dry: Within 1 hour - Hard dry: Within 6 hours (25°C) - Film Thickness: Wet film 550 μm, Dry film 250 μm - Theoretical Coverage: 17.2 ㎡/L, 15.2 ㎡/kg (varies by color) - Recoating Interval: Minimum 8 hours - Volume Solids: Above 45% (varies by color) - Thinner: Tap Water - Thinner Dosage: 0~5% - Compatible Primers & Intermediate Coat: No.420 Solvent-Based Elastomeric Sealer, No.420-1 Water-Based Elastomeric Sealer, No.420-2 Water-Based Elastomeric Middle Coating - Storage Stability: Minimum 3 years when stored in cool, dry warehouse above 0°C ## Application Methods Brush Coating, Spray Coating, Roller Coating (Apply 2~3 coats, recommended total dry film ≥250 μm) ## Construction Precautions ⚠️ 1. Stir thoroughly before use. Dilute with tap water within specified dosage if the paint is too thick. 2. Fresh cement walls contain excessive moisture and free alkaline substances, which will impair film performance and adhesion. Allow 2~3 weeks full drying until moisture content drops below 12% before construction. 3. Fully remove grease, dust and other contaminants from substrate surfaces prior to coating. 4. Construction Conditions: Ambient relative humidity below 85%RH, temperature ≥10°C. 5. Always prime with No.420 or No.420-1 elastomeric primer first to achieve optimal adhesion and durability. ## Note All data provided in this product datasheet are derived from internal laboratory tests for construction design reference only. Actual performance varies subject to different construction environments. This document does not constitute any legally binding warranty or statement from the manufacturer. Contact our technical department for clarification of any uncertainties.