PPG - Sigmafast 278 is a two-component, high solids, zinc phosphate epoxy primer and buildcoat in protective coating systems.

Features

• Excellent corrosion resistance in atmospheric exposure
• Cures at temperatures down to -5°C (23°F)
• Speed curing in steel fabrication
• Easy application by airless spray
• Wide application range
• ACQPA 27752-certified

Surface preparation

Apply this product to the specified thickness as soon as possible after the surface is prepared

Substrate conditions

• Steel; blast cleaned to ISO-Sa2½ or minimum SSPC SP-6, blasting profile 40 – 70 µm (1.6 – 2.8 mils) or power tool

cleaned to minimum ISO-St3 / SSPC SP3

Primed steel or previous coat

• Previous suitable coat must be dry and free from any contamination
• Surface of previous coat should be sufficiently roughened if necessary
• When applied to zinc silicate, a mist coat and full coat technique is required

Galvanized steel

• The surface must be properly prepared, dry, clean and free of any contamination
• The surface should be sufficiently roughened by sweep blasting to achieve a uniform matt appearance
• Sweep blast in accordance with the SSPC SP-16 guidelines

Stainless steel

• The surface must be properly prepared, dry, clean and free of any contamination
• The surface should be sufficiently roughened by sweep blasting with inert non-metallic abrasives
• Sweep blast in accordance with the SSPC SP-16 guidelines

Substrate temperature and application conditions

• Substrate temperature during application and curing should be at least 3°C (5°F) above dew point
• Substrate temperature during application and curing down to -5°C (23°F) is acceptable; provided the substrate is free from ice and dry

Instructions for use

Mixing ratio by volume: base to hardener 75:25 (3:1)

• The temperature of the paint should preferably be above 15°C (59°F), otherwise extra thinner may be required to obtain application viscosity
• Adding too much thinner results in reduced sag resistance and slower cure
• Thinner should be added after mixing the components

Air spray

Recommended thinner

THINNER 91-92

Volume of thinner

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

Nozzle orifice

1.7 – 2.0 mm (approx. 0.070 – 0.079 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 - 10%, 30 - 50% when mist coat applied

Nozzle orifice

Approx. 0.46 – 0.53 mm (0.018 – 0.021 in)

Nozzle pressure

20.0 - 25.0 MPa (approx. 200 - 250 bar; 2901 - 3626 p.s.i.)

Brush/roller

Recommended thinner

THINNER 91-92

Volume of thinner

0 – 5%

Notes:

- Application by roller will leave roller marking and is suitable for minimum DFT requirements only

- A roller suitable for epoxy application must be used

- Application by brush may show brush marking, due to the thixatropic nature of the paint and is most suitable to small areas, tight angle areas or for stripe coating or touch-up

Cleaning solvent

THINNER 90-53