Series 94-H²O


Generic Type

Aromatic Urethane, Zinc-Rich

Common Usage

A single-component, moisture-cured, zinc-rich primer for steel structures, including the interior and exterior of steel potable water tanks. Commonly used in commercial, industrial, and marine markets in various applications to provide outstanding long-term corrosion resistance when used as a primer in conjunction with other Tnemec coatings. Series 94-H2O has no maximum recoat time, cures quickly and offers rapid recoat at surface temperatures down to 35°F (2°C). Note: When used in conjunction with cathodic protection, anodes or impressed current systems should not provide current demand more negative than –1.05 volts relative to a copper–copper sulfate reference electrode half-cell.

Special Qualifications

Certified by NSF International in accordance with NSF/ANSI/CAN Std. 61 and the extraction requirements of NSF/ANSI/CAN 600. Reference Tnemec’s certified product listing at for additional details.

Meets zinc-rich primer requirements of the latest edition of AWWA D102 Standard for Inside System No. 3, 5, and 6 and Outside System No. 3, 4, and 6. Series 94-H2O uses a zinc pigment which meets the requirements of ASTM D 520 Type III and contains less than 0.002% lead.

Series 94-H2O meets the requirements of LEED-Low-Emitting Materials, Collaborative for High-Performance Schools-Paints & Coatings, WELL Building Standard-VOC Restrictions, and Living Building Challenge–Healthy Interior Performance. Contact your Tnemec representative for more information.

This product is part of a coating system tested in accordance with ISO 12944-6 (2018). Contact your Tnemec representative for coating system test results.

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  • Greenish-Gray

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Volatile Organic Compounds

Unthinned: 0.74 lbs/gallon (89 grams/litre)
Thinned 15% (No. 49 Thinner): 0.74 lbs/gallon (89 grams/litre)
Thinned 10% (No. 3 Thinner): 1.57 lbs/gallon (188 grams/litre)
Thinned 10% (No. 2 Thinner): 1.56 lbs/gallon (187 grams/litre)

Number of Components


Recommended DFT

2.5 to 3.5 mils (65 to 90 microns) per coat. Note: Reference the NSF website at for details on the maximum allowable DFT.


Unthinned: 1.68 lbs/gal solids
Thinned 15% (No. 49 Thinner): 1.68 lbs/gal solids
Thinned 10% (No. 3 Thinner): 1.72 lbs/gal solids
Thinned 10% (No. 2 Thinner): 2.84 lbs/gal solids


Interior: Series 21, 22, FC22, L140, L140F, N140, N140F, 215, 406.
Exterior: Series 66, L69, L69F, N69, N69F, 73, 115, V115, 156, 161, 215, 1026, 1028, 1029, 1080, 1081, 1094, 1095, 1096. Note: Certain topcoat colors may not provide one-coat hiding depending on the method of application. Contact your Tnemec representative. Note: Series 94-H2O must be exterior exposed for three days prior to topcoating with Series 1028 or 1029.

Theoretical Coverage

996 mil sq ft/gal (24.4 m²/L at 25 microns). See APPLICATION for coverage rates.

Curing Time

Without 44-710

|Temperature †||To Handle||To Recoat|
|75°F (24°C)||2 hours||8 hours|
|55°F (11°C)||4 hours||12 hours|
|35°F (2°C)||6 hours||16 hours|
---† 50% relative humidity. Note: Refer to product listings on for specific potable water return to service information. Curing time will vary with surface temperature, humidity, and film thickness. Ventilation: When used in enclosed areas, provide adequate ventilation during application and cure. Note: For faster curing, low humidity, and low-temperature applications, add No. 44-710 Urethane Accelerator (see separate product data sheet). Note: For cure times to immersion service, reference the specified Tnemec interior topcoat product data sheet.

Volume Solids

62.0 ± 2.0% (mixed)

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