1. Product Description

INCRALAC is a one-component, air-drying, transparent acrylic lacquer based on a methyl methacrylate copolymer binder with the addition of a corrosion inhibitor. It is intended for the protection of copper, brass, bronze, and other copper alloys against corrosion, tarnishing, and stains. The lacquer forms a hard, elastic film with a high gloss.

2. Areas of Use

• Architectural and decorative elements made of copper, brass, and bronze (railings, fittings, tiles, inscriptions)
• Parts on vessels (furniture, equipment, fittings)
• Artworks, monuments, and restoration applications
• Interior and exterior exposed metal parts where long-lasting protection and high aesthetics are required

Incralac is not recommended for surfaces that are constantly mechanically stressed or frequently touched by hands (handles, knobs, etc.), as the film wears out quickly in those areas.

3. Main Properties

• Air-drying, one-component acrylic lacquer
• Very good adhesion to copper and copper alloys
• Excellent resistance to UV light, limited yellowing, and loss of gloss during aging
• Contains organic corrosion inhibitor
• Good compromise between hardness (approx. 2H) and toughness of the film
• Transparent, colorless film
• Fast drying at room temperature
• Can be removed with suitable organic solvents (e.g., xylene, nitro thinner)

4. Typical Technical Data

5. Surface Preparation

1. Mechanically or chemically clean the metal to remove oxides, rust, stains, and dirt.
2. After polishing, be sure to remove all polishing pastes and residues with a suitable degreaser (ethyl acetate, xylene, etc.).
3. The surface must be dry, clean, free of grease and salts; the recommended maximum moisture content is < 4 % and no condensation.

For conservation applications, it is common practice to treat the metal with a benzotriazole solution after cleaning, and then apply INCRALAC after complete drying.

6. Application

• Application method: brush, air spraying; in some formulations also dipping.
• Dilution: generally undiluted; if necessary, dilute with ethyl acetate or xylene.
• Application conditions: do not apply below 10 °C or at relative humidity above 80 % — the substrate should be at least 3 °C above the dew point.
• Number of layers: 3–4 thin layers, each 6–10 µm of dry film.
• Time between layers: approximately 15 minutes (until 'touch dry').
• Note: avoid strong 'pulling' of the brush over partially dried layers to avoid softening the lower layers.

To restore protection after a few years, gently clean the surface of dust and dirt and apply 1–2 additional layers.

7. Drying

At 23 °C and 50 % relative humidity:

• Touch dry: 10–15 minutes
• Hard dry: approximately 1 hour
• Minimum time before exposure to aggressive external influences: 2–3 days; for optimal durability: 7 days of conditioning

Lower temperature and/or higher humidity slow down drying.

8. Theoretical Consumption

Theoretical consumption depends on substrate roughness, losses during application, and thickness: approximately 6–8 m²/L at a total dry thickness of 20–25 µm (3–4 coats). Practical consumption is usually 20–30 % lower than theoretical due to losses.

9. Storage and Shelf Life

• Store in well-sealed original containers in a dry and well-ventilated area.
• Storage temperature: typically 5–25 °C (never above 35 °C).
• Avoid direct sunlight and sources of heat/ignition.
• Shelf life: 12 months from the date of manufacture (may vary depending on supplier and climatic zone).

10. Safety and Environment

• The product is a highly flammable solvent mixture (typical classification: very flammable liquid; may cause skin and eye irritation).
• Follow local regulations for the storage and use of flammable solvents.
• Ensure good ventilation while working; use PPE (gloves, eye protection, respirator if necessary).
• For details on hazards, protection, and waste, see the safety data sheet.