PPG SigmaCover 456 is a two-component, high-build, polyamide-cured recoatable epoxy coating. The general-purpose epoxy buildcoat or finish is available in 2,600+ colours, inc. RAL, BS, NCS & the new NCS 2050 colours and is used in protective coating systems for steel and concrete structures exposed to atmospheric land or marine conditions, curing at temperatures down to -10°C (14°F), and has good adhesion on most aged, sound alkyd, chlorinated rubber and epoxy coatings. SigmaCover 456 can be recoated with various two-component and conventional coatings, even after long weathering periods. 

Features & Benefits

• Available in 350+ colours from RAL and BS
• General-purpose epoxy buildcoat or finish in protective coating systems, for steel and concrete structures exposed to atmospheric land or marine conditions
• Two-component, high-build, polyamide-cured recoatable epoxy coating
• Easy application, both by airless spray and brush
• Cures even at temperatures down to -10°C (14°F)
• A high relative humidity (maximum 95%) during application and curing does not influence the quality of the coating
• Good adhesion on most aged, sound alkyd, chlorinated rubber and epoxy coatings
• Can be recoated with various two-component and conventional coatings, even after long weathering periods
• Resistant to water and splash of mild chemicals
• Tough, with long-term flexibility
• No induction time
• 6 hours pot life
• Touch dry in 3 hours
• Fully cured after 7 days
• Can be applied by air spray, brush or roller
• See below for more information on surface preparation, application details and curing times

Product Data

Two-component, high-build, polyamide-cured recoatable epoxy coating

Notes:

• See below for more information on surface preparation, application details and curing times

Surface Preparation

Recommended Substrate Conditions and Temperatures

Substrate conditions

• Compatible previous coat must be dry and free from any contamination Substrate temperature
• Substrate temperature during application and curing down to -10°C (14°F) is acceptable; provided the substrate is free from ice and dry
• Substrate temperature during application and curing should be at least 3°C (5°F) above dew point

Substrate Temperature & Application Conditions

• Substrate temperature during application and curing down to -10°C (14°F) is acceptable; provided the substrate is free from ice and dry
• Substrate temperature during application and curing should be at least 3°C (5°F) above dew point

Application

Instructions for Use

Mixing ratio by volume: base to hardener 82:18

• Adding too much thinner results in reduced sag resistance
• The temperature of the mixed base and hardener should be above 10°C (50°F), otherwise extra thinner may be required to obtain application viscosity
• Thinner should be added after mixing the components

Induction Time

None.

Pot life

• 5 hours at 20°C (68°F)

Refer below for more information

Air Spray

Recommended thinner

• THINNER 91-92

Volume of thinner

• 5 - 10%, depending on required thickness and application conditions

Nozzle orifice

• 2.0 – 3.0 mm (approx. 0.079 – 0.110 in)

Nozzle pressure

• 0.3 - 0.4 MPa (approx. 3 - 4 bar; 44 - 58 p.s.i.)

Airless spray

Recommended thinner

• THINNER 91-92

Volume of thinner

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

Nozzle orifice

• Approx. 0.48 – 0.58 mm (0.019 – 0.023 in)

Nozzle pressure

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

Brush/roller

Recommended thinner

• THINNER 91-92

Volume of thinner

• 0 – 5%

Cleaning Solvent

• THINNER 90-53

Spreading Rate and Film Thickness

Note:

• Maximum DFT when brushing: 60 µm (2.4 mils)

Overcoating interval for DFT up to 150 µm (6.0 mils)

Notes:

• Surface should be dry and free from chalking and contamination
• SIGMACOVER 435 should not be overcoated with coal tar epoxy coatings

Curing time for DFT up to 150 µm (6.0 mils)

Notes:

• Adequate ventilation must be maintained during application and curing (please refer to information sheets 1433 and (1434)
• In exceptional cases SIGMACOVER 456 may be applied at lower substrate temperatures (down to -15°C (5°F)) provided that the surface is free from ice and other contamination. In such cases special care must be taken to avoid thick film application as this may lead to checking/crazing or solvent entrapment. It should be clear that application at lower temperatures will require additional thinning to obtain application viscosity, however this will affect the sag resistance of the applied coating and can induce solvent retention. Optimal curing and designed product properties will only be achieved when minimum required substrate temperature is reached

Pot Life (at application viscosity)

Safety Precautions

• For paint and recommended thinners, see information sheets information sheet 1430, information sheet 1431 and the relevant Material Safety Data Sheets in the attachments section above
• This is a solvent-borne paint and care should be taken to avoid inhalation of spray mist or vapour, as well as contact between the wet paint and exposed skin or eyes

References

• Conversion Tables (information sheet 1410)
• Explanation to product data sheets (information sheet 1411)
• Safety Indicators (information sheet 1430)
• Safety in Confined Space and Health Safety, Explosion Hazard - Toxic Hazard (information sheet 1431)
• Safe Working in Confined Spaces (information sheet 1433)
• Directives for Ventilation Practice (information sheet 1434)
• Surface Preparation of Concrete Floors (Information Sheet 1496)
• Relative humidity - Substrate Temperature - Air Temperature (information sheet 1650)