PPG SigmaCover 400/Amerlock 400 is a two-component, high solids, high performance self priming universal epoxy coating for steel and concrete, galvanising, stainless steel and non-ferrous metals.

Features

• 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
• Available in MIO or conventional pigmented grade
• Good resistance to splash and spillage of chemicals

Recommended Substrate Conditions and Temperatures

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)

System Specification

Primers:

Direct to substrate; DIMETCOTE Series, AMERCOAT 68 Series, AMERLOCK 2 / 400 Series, SIGMAZINC Series, AMERCOAT Epoxies and SIGMA Epoxies

Topcoats:

AMERCOAT 450 Series, SIGMADUR Series, SIGMACOVER Epoxies, AMERCOAT Epoxies, AMERSHIELD and PSX 700

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

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

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

THNNER 90-53, OR THINNER 21-06 (AMERCOAT 65)