PRODUCT DATASHEET

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COLOR AND GLOSS LEVEL

• White and various other colors (see also SIGMACARE shade card)
• Gloss finish

Note:
Certain colors (red, orange, yellow) may require additional coats for adequate hiding, especially when applied over primers with significant color contrast.

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BASIC DATA AT 20°C (68°F)

(Mixed Product)

Property	Value
Number of Components	Two
Mass Density	1.3 kg/l (10.8 lb/US gal)
Volume Solids	55 ± 2%
VOC (Supplied)	Directive 1999/13/EC, SED: max. 334.0 g/kg EUR Directive 2004/42/IIA(i)(500): max. 430.0 g/l (~3.6 lb/gal)
Recommended DFT	50–60 µm (2.0–2.4 mils)
Theoretical Spreading Rate	11.0 m²/l @ 50 µm (441 ft²/US gal @ 2.0 mils)
Dry to Touch	1 hour
Overcoating Interval	Minimum: 6 hours Maximum: Unlimited
Full Cure	4 days
Shelf Life	Base: ≥36 months (cool, dry) Hardener: ≥24 months (cool, dry)

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RECOMMENDED SUBSTRATE CONDITIONS AND TEMPERATURES

Substrate Conditions

• Previous coat (epoxy or polyurethane) must be dry and free of contamination
• Previous coat should be sufficiently roughened if necessary

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Substrate Temperature & Application Conditions

• Application at –5°C (23°F) acceptable if the substrate is dry and ice-free
• Substrate must be ≥ 3°C (5°F) above dew point during application & curing
• Relative humidity ≤ 85%
• Condensation during or soon after application may cause color and gloss change

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INSTRUCTIONS FOR USE

Mixing Ratio (By Volume)

Base : Hardener = 88 : 12

• Mixed paint temperature should be >10°C (50°F)
• Thinner must be added after mixing
• Excess thinner reduces sag resistance

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Induction Time

None

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Pot Life

5 hours at 20°C (68°F)
(See Additional Data – Pot Life)

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APPLICATION METHODS

Air Spray

Parameter	Value
Recommended Thinner	THINNER 21-06
Volume of Thinner	3–5%
Nozzle Orifice	1.0–1.5 mm (0.040–0.060 in)
Nozzle Pressure	0.3–0.4 MPa (3–4 bar; 44–58 psi)

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Airless Spray

Parameter	Value
Recommended Thinner	THINNER 21-06
Volume of Thinner	3–5%
Nozzle Orifice	0.43–0.48 mm (0.017–0.019 in)
Nozzle Pressure	20.0 MPa (200 bar; 2901 psi)

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Brush / Roller

Parameter	Value
Recommended Thinner	THINNER 21-06
Volume of Thinner	0–5%
Cleaning Solvent	THINNER 90-53

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ADDITIONAL DATA

Spreading Rate & Film Thickness

DFT	Theoretical Spreading Rate
50 µm (2.0 mils)	11.0 m²/l (441 ft²/US gal)
60 µm (2.4 mils)	9.2 m²/l (368 ft²/US gal)

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OVERCOATING INTERVAL

For DFT up to 50 µm (2.0 mils)

Overcoating with Itself

Temperature	Minimum	Maximum
–5°C (23°F)	24 hours	Unlimited
0°C (32°F)	16 hours	Unlimited
10°C (50°F)	8 hours	Unlimited
20°C (68°F)	6 hours	Unlimited
30°C (86°F)	5 hours	Unlimited
40°C (104°F)	3 hours	Unlimited

Surface must be dry and contamination-free.

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CURING TIME

For DFT up to 60 µm (2.4 mils)

Substrate Temperature	Dry to Handle	Full Cure
–5°C (23°F)	24 hours	15 days
0°C (32°F)	16 hours	11 days
10°C (50°F)	8 hours	6 days
20°C (68°F)	6 hours	4 days
30°C (86°F)	5 hours	3 days
40°C (104°F)	3 hours	48 hours

Notes:

• Adequate ventilation must be maintained
• Early condensation or rain may cause color and gloss change

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POT LIFE (Application Viscosity)

Temperature	Pot Life
10°C (50°F)	7 hours
20°C (68°F)	5 hours
30°C (86°F)	3 hours
40°C (104°F)	2 hours

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SAFETY PRECAUTIONS

• Solvent-borne paint → avoid inhalation of spray mist/vapor
• Contains toxic polyisocyanate curing agent
• Avoid inhalation of aerosol spray mist
• Avoid contact with skin or eyes

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WORLDWIDE AVAILABILITY

SIGMADUR 550 may vary slightly depending on local rules/regulations.
Alternative Product Data Sheets may be used.

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WARRANTY & LIMITATIONS OF LIABILITY

Contains full PPG warranty and legal disclaimers exactly as in your PDF.

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REFERENCES

Product Data Sheet – SIGMADUR™ 550
Issued by PPG Protective & Marine Coatings
Document Reference: 7537
Publication Date: November 3, 2021
Source: https://www.ppgpmc.com

Technical Guidelines & Safety Information
Last accessed: 28 May 2025