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 (with or without 44-710 Urethane Accelerator) in accordance with ANSI/NSF/CAN Std. 61 and the extraction requirements of NSF/ANSI/CAN 600 and is qualified for use on interior potable water tanks of 1,500 gallons (5,678 L) or greater. Topcoating with Std. 61 certified Tnemec coatings is required. Contact your Tnemec representative for specific recommendations. Reference Tnemec's certified product listing at for details on maximum allowable DFT. Meets zinc-rich primer requirements of AWWA D102-21 Standard for Inside System No. 3, 5 & 6 and Outside System No. 3, 4 & 6. Series 94-H2O uses a zinc pigment which meets the requirements of ASTM D 520 Type III and contains less than .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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Interior: Series 20, FC20, 22, FC22, L140, L140F, N140, N140F, V140, V140F, 141, 215, 406.
Exterior: Series 27WB, 66, L69, L69F, N69, N69F, 72, 73, 115, V115, 156, 161, 215, 1026, 1028, 1029, 1074, 1074U, 1075, 1075U, 1080, 1081, 1094, 1095, 1096. Note: Certain topcoat colors may not provide one-coat hiding depending on 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. Note: Series 94-H2O must be exterior exposed for one day prior to topcoating with Series 27WB.

Number of Components


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)

Recommended DFT

2.5 to 3.5 mils (65 to 90 microns) per coat.

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)


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

Theoretical Coverage

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

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