SigmaCover 400/Amerlock 400 is a two-component, high solids epoxy coating for steel and concrete, galvanising, stainless steel and non-ferrous metals. The coating has good adhesion on existing coats and is compatible with prepared, damp surfaces.

Available in black, Persian Grey (BS 00A05), white, and  2,300+ colours, inc. RAL, BS, NCS & the new NCS 2050 colours

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Product Qualifications

• Compliant with USDA Incidental Food Contact Requirements
• NFPA Class A for Flame Spread and Smoke Development
• Qualified for ANSI/NSF Standard 61 (potable water) for valves only. For NSF application instructions, please visit the NSF website
• MPI Category #108
• Nuclear Service Level 2 (ANSI N 5.12, ANSI N 101.2)
• LEED’s compliant for Anti-corrosive Paint category

Features & Benefits

• Available in 350+ colours from RAL & BS
• High performance self priming universal epoxy
• High solids, low VOC
• Surface tolerant and abrasion resistant
• Compatible with prepared, damp surfaces
• Good adhesion on most existing coatings
• Temperature resistant up to 120°C (250°F)
• Available in MIO or conventional pigmented grade
• Good resistance to splash and spillage of chemicals
• Meets NSF Standard 61 for valves
• No induction time
• 2 hours pot life
• Touch dry in 6 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

Note:

• Epoxy coatings will chalk and fade with exposure to sunlight. Light colours are prone to ambering to some extent. Note that product tinted to custom colours are not recommended for immersion service. Only use factory grind batches for immersion

Product Data

Two-component, high-build polyamide cured anticorrosive epoxy primer/coating.

Notes:

• Intermittent temperature resistance should be less than 5% of the time, and maximum 24 hours
• Temperature resistance is in atmospheric condition. Please contact Rawlins Paints Technical for immersion condition

Surface Preparation

Recommended Substrate Conditions and Temperatures

Substrate conditions

• Coating performance is proportional to the degree of surface preparation. Remove all loose paint, mill scale, and rust
• The surface to be coated must be dimensionally stable, dry, clean and free of grease, oil, and other foreign materials
• When proper abrasive blast surface preparation is not practical, surfaces should be chipped clean and wire brushed to bare, clean material

Carbon Steel

• For immersion service: steel; blast cleaned to ISO-Sa2½ (SSPC SP-10)
• For atmospheric service, abrasive blast to ISO-Sa2½ or minimum SSPC SP-6, power tool cleaned to ISO-St3 (SSPC SP-3) or hand tool cleaned to ISO-St2 (SSPC SP-2) or ultra high pressure water jet to SSPC SP WJ-2(L) / NACE WJ-2(L)

Concrete / Masonry

• Remove grease, oil and other penetrating contaminants according to ASTM D4258
• Abrade the surface per ASTM D4259 to remove all chalk and surface glaze or laitance. Achieve surface profile - ICRI CSP 3 to 5
• Fill voids as necessary with AMERCOAT 114 A epoxy filler
• Maximum recommended moisture transmission rate is 3 lbs / 1,000 ft2 / 24 hours by moisture transmission test (ASTM F1869, calcium chloride test or by ASTM D4263, plastic sheet test)
• Alternatively, ASTM D4944 (Calcium Carbide Gas method) can be used, moisture content should not exceed 4%

Galvanized steel

• Remove oil or soap film with detergent or emulsion cleaner
• Lightly abrasive blast with a fine abrasive in accordance with SSPC SP-16 guidelines to achieve a profile of 40 - 75 µm (1.5 - 3.0 mils). When light abrasive blasting is not possible, galvanizing can be treated with a suitable zinc phosphate conversion coating
• Galvanizing that has had at least 12 months of exterior weathering may be coated after power washing to remove all contaminants and white rust

Non-ferrous metals and stainless steel

• Remove all rust, dirt, moisture, grease or other contaminants from the surface
• Lightly abrasive blast with a fine abrasive in accordance with SSPC SP-16 guidelines to achieve a profile of 40 - 100 µm (1.5 - 4.0 mils)

Aged coatings and repairs

• Aged suitable coating must be dry and free from any contamination
• For single-pack coatings, extra precautions are necessary

Substrate Temperature & Application Conditions

• Substrate temperature during application and curing should be between 5°C (41°F) and 50°C (122°F)
• Substrate temperature during application and curing should be at least 3°C (5°F) above dew point

System Specification

Primers:

• Direct to substrate
• DIMETCOTE Series
• AMERCOAT 68 Series
• AMERLOCK 2 / 400 Series
• SIGMAZINC Series
• AMERCOAT Epoxies
• SIGMA Epoxies

Topcoats:

• AMERCOAT 450 Series
• SIGMADUR Series
• SIGMACOVER Epoxies
• AMERCOAT Epoxies
• AMERSHIELD
• PSX 700

Application

Instructions for Use

Mixing ratio by volume: base to hardener 50:50 (1:1)

• The paint should be stirred well before use, preferably by means of a mechanical mixer, to ensure homogeneity
• Add hardener to base and continue stirring until homogeneous

Induction Time

None.

Pot life

• 2 hours at 20°C (68°F)

Refer below for more information

Air Spray

Recommended thinner

• THINNER 91-92 FOR GLOBAL
• THINNER 21-06 (AMERCOAT 65) FOR NSF/ANSI 61
• THINNER 21-25 (AMERCOAT 101) for NON NSF/ANSI 61 and > 90°F (32°C)

Volume of thinner

• 0 - 10%, depending on required thickness and application conditions

Airless spray

Recommended thinner

• THINNER 91-92 FOR GLOBAL
• THINNER 21-06 (AMERCOAT 65) FOR NSF/ANSI 61
• THINNER 21-25 (AMERCOAT 101) for NON NSF/ANSI 61 and > 90°F (32°C)

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 - 18.0 MPa (approx. 150 - 180 bar; 2176 - 2611 p.s.i.)

Brush/roller

Recommended thinner

• Brush: apply evenly using a clean, well-loaded brush
• Application by brush or roller will provide approximately 80 µm (3.1 mils) DFT in a single-coat application

Cleaning Solvent

• THINNER 90-53
• THINNER 90-58 (AMERCOAT 12)
• THINNER 21-06 (AMERCOAT 65)

Spreading Rate and Film Thickness

Overcoating interval for DFT up to 125 µm (5.0 mils)

Note:

• PPG 861 (AMERCOAT 861) accelerator (1 pint per 5 gallons) will reduce min. and max. recoat interval to half (US supply only)
• Surface should be dry and free from any contamination
• A detergent wash with PREP 88, SIGMARITE 88 or equivalent is required prior to application of topcoats after 30 days of exposure
• If maximum recoat time has been exceeded, roughen surfaces
• Alkyd coatings and waterborne acrylic coatings should be applied after the film is dry to handle and not greater than three times dry to handle time
• Maximum recoating time is highly dependent upon actual surface temperature - not simply air temperatures. Sun-exposed or otherwise heated surface will shorten the maximum recoat window

Curing time for DFT up to 125 µm (5.0 mils)

Notes:

• Adequate ventilation must be maintained during application and curing (please refer to information sheets 1433 and (1434)
• PPG 861 (AMERCOAT 861) accelerator (1 pint per 5 gallons) will reduce curing time to half

Pot Life (at application viscosity)

Note:

• PPG 861 (AMERCOAT 861) accelerator (1 pint per 5 gallons) will reduce pot life to half

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 vapor, 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)
• Cleaning of Steel and Removal of Rust (information sheet 1490)
• Specification for Mineral Abrasives (information sheet 1491)
• Surface Preparation of Concrete Floors (Information Sheet 1496)
• Relative humidity - Substrate Temperature - Air Temperature (information sheet 1650)