PPG SigmaCover 555 – Epoxy Anticorrosive Tiecoat for Underwater Systems

PPG SigmaCover 555 is a two-component, polyamide-cured epoxy tiecoat formulated for use as the final layer in underwater epoxy anticorrosive systems. Designed to provide a strong bond between anticorrosive epoxy layers and antifouling topcoats, it delivers excellent durability, abrasion resistance and long-term underwater performance.

With rapid curing properties, SigmaCover 555 can enter water immersion service after just 48 hours, making it ideal for marine applications where quick turnaround is required. Its strong adhesion profile and robust resistance characteristics ensure long-lasting protection against impact, corrosion and aggressive marine exposure.

Available in black or grey, it is suitable for new construction, maintenance, and dry dock applications.

Key Features:

• Two-component epoxy tiecoat for underwater anticorrosive systems

• Excellent adhesion to antifouling coatings

• Outstanding water resistance and long-term durability

• High abrasion and impact resistance

• No induction time – 4-hour pot life

• Ready for immersion in 48 hours; fully cured in 7 days

• Available in black or grey

• Ideal for ships, hulls, underwater structures and marine steelwork

Surface Preparation

Substrate conditions
• Previous coat must be dry and free from any contamination
Substrate temperature and application conditions
• Substrate temperature during application and curing should be above -5°C (23°F)
• Substrate temperature during application and curing down to -5°C (23°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

Technical Data

Pot life
4 hours at 20°C (68°F)
Note:
- See ADDITIONAL DATA – Pot life

Spreading rate and film thickness
DFT Theoretical spreading rate
75 µm (3.0 mils) 7.5 m²/l (299 ft²/US gal)
100 µm (4.0 mils) 5.6 m²/l (225 ft²/US gal)
150 µm (6.0 mils) 3.7 m²/l (150 ft²/US gal)

Directions for Use

Mixing ratio by volume: base to hardener 6.14:1
• 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

Mixed product induction time
Mixed product temperature Induction time
Below 10°C (50°F) 15 minutes

Air spray
Recommended thinner
THINNER 91-92
Volume of thinner
0 - 5%, depending on required thickness and application conditions
Nozzle orifice
1.5 – 2.0 mm (approx. 0.060 – 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. 0.53 – 0.58 mm (0.021 – 0.023 in)
Nozzle pressure
12.0 - 15.0 MPa (approx. 120 - 150 bar; 1741 - 2176 p.s.i.)
Brush/roller
Recommended thinner
THINNER 91-92
Volume of thinner
Up to 5% THINNER 91-92 can be added if desired
Cleaning solvent
• THINNER 90-53

Data Sheets

SigmaCover 555 TDS

SigmaCover 555 Base MSDS

SigmaCover 555 Hardener MSDS