PPG AquaCover 400 (also known as Sigma Aquacover 400) is a two-component, polyamine-cured, waterborne epoxy coating for steel structures in atmospheric exposure. Touch dry in 90 minutes, the coating is free from lead- and chromate-containing pigments, making it particularly suitable when solvents are not permitted because of health and safety reasons. Can be overcoated with most dispersion and alkyd paints, and 2-component durable finishes.

Also suitable for concrete floors.

Top Features & Benefits

• Free from lead- and chromate-containing pigments
• Can be overcoated with most dispersion and alkyd paints, and two-component durable finishes
• Easy application by brush/roller and (airless) spray
• Semi-gloss finish

Product Data

Basic data at 20°C (68°F)

Notes:

• Refer to tables below for information regarding spreading rate and film thickness, overcoating intervals and curing times

Preparation & Application

Recommended Substrate Conditions & Temperatures

Substrate conditions

• Steel with suitable primer must be dry and free from any contamination within the recoat times
• Galvanized surfaces are variable and the preferred method of treatment is to lightly sweep blast followed by degreasing and cleaning
• Concrete; surface must be cured, clean, dry and free of desintegrated or chalky materials

Substrate Temperature & Application Conditions

• Substrate temperature during application and curing should be above 10°C (50°F)
• Substrate temperature during application and curing should be at least 3°C (5°F) above dew point
• Relative humidity during application and curing should not exceed 75%

Instructions For Use

Mixing ratio by volume: base to hardener 70:30

• Adequate ventilation must be maintained during application and curing (please refer to INFORMATION SHEETS 1433 and 1434)
• Too much water results in reduced sag resistance and slower cure
• Must be protected from freezing at all times during storage and/or transport
• The temperature of the mixed base and hardener should preferably be above 15°C (59°F), otherwise extra thinner may be required to obtain application viscosity
• Water should be added after mixing the components

Application

Air spray

Recommended Thinner

• Tap water

Volume of thinner

• 0 - 5%, depending on required thickness and application conditions

Nozzle orifice

• Approx. 0.48 mm (0.019 in)

Nozzle pressure

• 15.0 MPa (approx. 150 bar; 2176 p.s.i.)

Brush/roller

Recommended Thinner

• Tap water

Volume of thinner

• 0 - 5%

Cleaning solvent

Cleaning procedures

• Pulsator filter and tip filter must be taken out of the equipment and cleaned properly
• The following tables illustrate the cleaning procedure of the spray equipment when changing from spraying with solventborne paint to waterborne paints (table 1) and from waterborne paints to solvent-borne paints (table 2)

Additional Data

Safety Precautions

Although this is a waterborne paint, care should be taken to avoid inhalation of spray mist, as well as contact between the wet paint and exposed skin or eyes.