Series 394


Generic Type

Aromatic Polyurethane, Mio-Zinc Filled Primer

Common Usage

Specially formulated, one-component, moisture-cured, micaceous iron oxide and zinc filled primer that offers superior bonding to marginally prepared rusty steel and tightly adhered old coatings. This high performance primer is ideal for corrosion resistance with a triple barrier mechanism of zinc, mio and urethane resin built into the dry film. It is suitable as a corrosion resistant primer under certain fireproofing systems. Contact your Tnemec representative for specific information.

Special Qualifications

UL classified in accordance with UL 263 (ASTM E119). Meets material adhesion test ASTM E 736 for use under various fire-resistive products. Contact your Tnemec representative for specific information. Meets AISC requirements in accordance with RCSC Appendix A for Class B surface with a mean slip coefficient no less than 0.50 and tension creep not in excess of .005 inches (.13 mm). Contact Tnemec Technical Service for more information. Note: Using other products as primers or topcoats voids AISC requirements.

Series 394 was tested in accordance with, and passed, the California Department of Public Health CDPH/EHLB/Standard Method Version 1.1, 2010 emissions testing and meets qualifications of LEED v4, Collaborative for High Performance Schools, and Living Building Challenge.

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Curing Time

Without 44-710

| Temperature †|| To Touch || To Handle || To Topcoat |
| 75°F (24°C) || 1/4 hour || 1 1/2 hours || 16 hours |
| 65°F (18°C) || 1/4 hour || 2 3/4 hours || 16 hours |
| 55°F (13°C) || 1/4 hour || 5 hours || 20 hours |
---† 50% Relative Humidity. Curing time will vary with surface temperature, humidity and film thickness.
Note: When recoating Series 394 with itself, the minimum recoat time is 2 hours at 70°F (21°C).

With 44-710: The use of 44-710 can greatly reduce dry to handle cure times. Note: 44-710 Accelerator must be used when the surface temperature falls below 50°F (10°C).


Unthinned: 0.75 lbs/gal solids
Thinned 10% (No. 49 Thinner): 0.75 lbs/gal solids


Self-priming, 90-97, 90G-1K97

Volume Solids

61.0 ± 2.0% (mixed)

Recommended DFT

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

Number of Components


Volatile Organic Compounds

Unthinned: 2.05 lbs/gallon (246 grams/litre)
Thinned 10% (No. 49 Thinner): 2.05 lbs/gallon (246 grams/litre)


Series 27, 27WB, 66, 66HS, L69, L69F, N69, N69F, 73, 113, 114, 115, 161, 161HS, 740, 750, 1026, 1028, 1029, 1074, 1074U, 1075, 1075U.
Note: If Series 394 is exterior exposed for 1 year or more it must be scarified or recoated with itself before topcoating. Scarification or recoating with itself is required if the Series 394 has been exterior exposed for 3 days or longer and Series 113 is the specified topcoat. Note: Series 115 requires the use of Series 44-900 adhesion promoter when topcoating Series 394. Note: Certain topcoat colors may not provide one coat hiding depending on method of application. Contact your Tnemec representative. Note: Series 394 must be exterior exposed for one day prior to topcoating with 27WB or three days prior to topcoating with 1028 or 1029.

Theoretical Coverage

978 mil sq ft/gal (24.0 m²/L at 25 microns). See APPLICATION for coverage rates.

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