PRODUCT DATASHEET

---

COLOR AND GLOSS LEVEL

• Gray, greenish gray
• Flat

---

BASIC DATA AT 20°C (68°F)

(Mixed Product)

Property	Value
Number of Components	Two
Mass Density	2.3 kg/l (19.2 lb/US gal)
Volume Solids	65 ± 2%
VOC (Supplied)	EU SED: max 219 g/kg max 507 g/l (4.2 lb/gal) GB 30981-2020: 522 g/l (4.4 lb/gal)
Recommended DFT	75–100 µm (3.0–4.0 mils)
Theoretical Spreading Rate	8.7 m²/l @ 75 µm (348 ft²/gal @ 3 mils)
Dry to Touch	30 minutes
Overcoating Interval	Min: 12 hours • Max: Unlimited
Full Cure	12 hours
Shelf Life	Binder: ≥9 months Pigment: ≥24 months (moisture free)

Notes:
See Additional Data: film thickness, overcoating, curing time.

---

RECOMMENDED SUBSTRATE CONDITIONS & TEMPERATURES

Immersion Exposure

• Steel blast cleaned to ISO Sa 2½, profile 40–70 µm
• Steel with zinc silicate shop primer: sweep blast to SPSS-Ss; welds & rusty areas blasted to Sa 2½

Atmospheric Exposure

• Steel blast cleaned to ISO Sa 2½
• Steel with zinc silicate shop primer: pretreated to SPSS-Pt3

Application Conditions

• Substrate temperature –5°C to 50°C acceptable (must be dry & ice-free)
• Substrate temperature must be 3°C above dew point
• Relative humidity must be above 50% for proper curing

---

INSTRUCTIONS FOR USE

Mixing Ratio (By Volume)

Binder : Zinc Powder = 81 : 19

Mandatory Mixing Procedure

To avoid lumps and ensure proper mixing:

1. Remove zinc powder bag from drum
2. Shake binder container lightly to homogenize
3. Pour ~2/3 of binder into empty drum
4. Shake remaining binder vigorously, add to drum
5. Add zinc powder gradually while stirring continuously (low speed)
6. Stir thoroughly at high speed until homogeneous
7. Strain through 30–60 mesh screen
8. Maintain continuous agitation during application

Note: At >30°C, up to 10% THINNER 90-53 may be required.

---

Induction Time

None

---

Pot Life

Temperature	Pot Life
20°C (68°F)	12 hours

See Additional Data for full table.

---

APPLICATION METHODS

Air Spray

Item	Value
Recommended Thinner	THINNER 90-53
Thinner Addition	0–10%
Nozzle Orifice	2.0 mm (0.079 in)
Pressure	0.3 MPa (3 bar; 44 psi)

Dedicated pump with constant agitation required.

---

Airless Spray

Item	Value
Recommended Thinner	THINNER 90-53
Thinner Addition	0–10%
Nozzle Orifice	0.48–0.64 mm (0.019–0.025 in)
Pressure	9–12 MPa (90–120 bar)

---

Brush / Roller

• Only for touch-up & spot repair
• Roller application not recommended

Item	Value
Recommended Thinner	THINNER 90-53
Thinner Addition	5–10%
Max Single-Coat DFT	25 µm (1.0 mil)

---

UPGRADING (Extra Coat Application)

• Spray only
• If DFT below spec: thin 25–50% with THINNER 90-53 to ensure a visible wet coat

---

ADDITIONAL DATA

Spreading Rate & Film Thickness

DFT	Theoretical Spreading Rate
75 µm	8.7 m²/l (348 ft²/gal)
100 µm	6.5 m²/l (261 ft²/gal)

Notes:

• Max brushing DFT: 35 µm

• 150 µm: mud cracking risk

• Required minimums:
  • Smooth steel: avg 75 µm (min 60 µm)
  • Rough steel: avg 100 µm (min 75 µm)

---

OVERCOATING INTERVAL (Up to 100 µm, 50% RH)

Temp	Minimum	Maximum
–5°C	24 hrs	Unlimited
0°C	24 hrs	Unlimited
10°C	18 hrs	Unlimited
20°C	12 hrs	Unlimited
30°C	6 hrs	Unlimited
40°C	4 hrs	Unlimited

Notes

• For recoating with itself: apply within 2 days
• MEK rub test per ASTM D4752 required for topcoating
• Higher humidity → faster curing
• Mist coat + full coat required when topcoating
• Curing can be accelerated 4 hrs after application by:
  1. Wetting with water for 2 hrs, then dry
  2. Wetting with 0.5% ammonia solution, then dry
• Maximum time unlimited only if surface is clean & contamination-free

---

CURING TIME (Up to 100 µm, 50% RH)

Temp	Dry to Handle	Full Cure
–5°C	2 hrs	24 hrs
0°C	2 hrs	24 hrs
10°C	1 hr	18 hrs
20°C	30 min	12 hrs
30°C	30 min	6 hrs
40°C	30 min	4 hrs

---

POT LIFE (Application Viscosity)

Temperature	Pot Life
0°C	24 hours
10°C	16 hours
20°C	12 hours
30°C	6 hours

---

SAFETY PRECAUTIONS

• Refer to SDS & product label
• Solvent-borne: avoid inhalation of vapors or spray mist
• Avoid contact with skin and eyes

---

WORLDWIDE AVAILABILITY

Products may vary slightly to comply with local rules.
Alternative PDS versions may be used.

---

WARRANTY & LIMITATIONS OF LIABILITY

Full PPG warranty and limitation text exactly as per document.

---

REFERENCES

Product Data Sheet – SIGMAZINC™ 158
Issued by PPG Protective & Marine Coatings
Document Reference: Ref. 7558
Publication Date: August 25, 2022
Source: https://www.ppgpmc.com

Technical Guidelines & Safety Information
Last accessed: 28 May 2025