Nippon Paint PU Recoatable Finish is a high-performance, two-pack aliphatic polyurethane coating designed to provide a highly durable finish with excellent gloss and color retention. Unlike standard epoxy finishes that may chalk when exposed to sunlight, this PU finish is specifically engineered for exterior use, offering outstanding resistance to UV radiation and weathering.
It forms a tough, easy-to-clean film that provides superior resistance to chemicals, abrasion, and environmental pollutants. It is the ideal topcoat for structural steelwork, storage tanks, bridges, and even high-end masonry surfaces where a long-lasting, aesthetic "showroom" finish is required in harsh outdoor conditions.
Paint Type: Two-pack Polyurethane (Solvent-based)
Finish: High Gloss / Soft Sheen
Color: Wide range of industrial and decorative colors
Mixing Ratio: 4 parts Base to 1 part Hardener (by volume)
Pot Life: 4 – 6 hours after mixing (at 25°C – 30°C)
Theoretical Coverage: 11.5 m² per litre (at 40μm DFT)
Drying Time (at 30°C):
Touch Dry: 1 hour
Hard Dry: 8 hours
Recoating Interval: Minimum 8 hours
Full Cure: 7 days
Shelf Life: Up to 24 months in a tightly sealed container
Mixing: Stir the Base (Part A) thoroughly. Add the Hardener (Part B) and mix until the mixture is completely uniform. Ensure the correct ratio is maintained for proper curing.
Thinning: Use Nippon PU Thinner.
Brush/Roller: Add 5–10% thinner if necessary.
Conventional Spray: Thin with 10–20% for optimal atomization.
Application Method: Spray application is recommended for a professional, mirror-like finish. Brush and roller are suitable for smaller areas or touch-ups.
Cleaning: Clean all tools and equipment immediately after use with Nippon PU Thinner.
For maximum durability on exterior steel or concrete, follow this sequence:
Primer (1 Coat): Nippon Paint 8048 Zinc Phosphate Primer QD or Nippon Paint EA9 Red Oxide Primer.
Intermediate (1 Coat): Nippon Paint EA4 Finish or Nippon Paint EA9 Finish HB.
Topcoat (2 Coats): Nippon Paint PU Recoatable Finish.
Existing Coatings: Ensure the intermediate epoxy coat is clean, dry, and free from oil or grease. If the intermediate coat has been exposed for more than 7 days, it must be lightly sanded to ensure mechanical adhesion.
Surface Cleanliness: Use a solvent wipe to remove any dust or contaminants before applying the PU topcoat.
Dryness: The surface must be completely dry. Any moisture present during application can react with the PU hardener, causing bubbles or loss of gloss.
Environmental Conditions: Do not apply if the relative humidity exceeds 85% or if the surface temperature is less than 3°C above the dew point.
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