SigmaCover 350, a two-component, high-build polyamide cured anticorrosive epoxy primer/coating for wide use in Marine and Protective Coatings such as topsides, decks, superstructures and cargo holds. The fast-curing primer can be used on concrete and steel, with good impact and abrasion resistance and excellent corrosion resistance, applying by spray, brush or roller.

Available in Grey, Aluminium, and the full RAL and BS range (more than 350 colours).

Features & Benefits

• Surface tolerant primer/coating for wide use in Marine and Protective Coatings
• Marine use: suitable on topsides, decks, superstructures and cargo holds
• Use on steel and concrete
• Good impact and abrasion resistance
• Fast-curing
• Smooth film, easy to clean
• Compatible with various aged coatings
• Excellent corrosion resistance
• Resistant to splash and spillage of a wide range of chemicals
• No induction time
• 3 hours pot life
• Touch dry in 2 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

For Cargo holds use gray (5177) and redbrown (6179) only

Some colours have their own specific safety data sheet - please contact our technical team on 0113 2455450 to obtain a copy.

Product Data

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

Notes:

• Refer below for more details on spreading rate and film thickness, overcoating intervals and curing times

Surface Preparation

Recommended Substrate Conditions and Temperatures

Substrate conditions

• Steel; blast cleaned to ISO-Sa2½ for excellent corrosion protection, blasting profile 40 – 70 µm (1.6 – 2.8 mils)
• Steel; blast cleaned to ISO-Sa2, blasting profile 40 – 70 µm (1.6 – 2.8 mils) or power tool cleaned to minimum ISO-St2 for good corrosion protection
• Coated steel; hydrojetted to VIS WJ2/3L
• Surface must be dry and free from any contamination
• Existing sound epoxy systems and most sound alkyd coating system; sufficiently roughened

Substrate conditions of concrete for thinned version

• Dried for at least 28 days in good ventilation conditions
• Moisture content should not exceed 4.5%
• Concrete must be sound, dry, free from laitance and any contamination
• Rough surface; eventually abraded by power tool or diamond abrading tool

Coated concrete

• Existing sound coating systems; sufficiently roughened, dry and cleaned
• To ensure compatibility, rub the existing coating with a cloth with Xylene or MEK for 10 seconds, and remove existing coatings if dissolving occurs
• Rough surface; eventually abraded by power tool or diamond abrading tool

Substrate Temperature & Application Conditions

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

System Specification

• SIGMACOVER 350: 2 x 125 µm (5.0 mils) DFT

Application

Instructions for Use

Mixing ratio by volume: base to hardener 80:20 (4:1)

• 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
• Adding too much thinner results in reduced sag resistance and slower cure
• Thinner should be added after mixing the components

Induction Time

None.

Pot life

• 3 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

• 1.8 – 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 - 5%, depending on required thickness and application conditions

Nozzle orifice

• Approx. 0.48 – 0.53 mm (0.019 – 0.021 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%

Note:

• 10 - 15% when applied as a primer direct to concrete

Cleaning Solvent

• THINNER 90-53

Spreading Rate and Film Thickness

Note:

• Maximum DFT when brushing: 100 µm (4.0 mils)

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

For application in Marine cargo holds and areas exposed to water immersion

For application in Marine areas subject to non-permanent exposure to splash water, seawater, spillage to chemicals etc.

For application in atmospheric exposure and industrial PC

Note:

• In cases of exposure to direct sunlight or when the surface is contaminated it is recommended that the surface be cleaned and roughened to ensure good adhesion of the subsequent coating.

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

Notes:

• For cargo hold application: for full cure for hard angular cargoes, please contact our technical team
• Adequate ventilation must be maintained during application and curing (please refer to information sheets 1433 and (1434)
• Should SIGMACOVER 350 or the total coating system (2 x 125 µm/2 x 5.0 mils) be applied in excess of the specified dry film thickness, then the time necessary to reach full cure will be increased

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 vapor, as well as contact between the wet paint and exposed skin or eyes

References

• 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)