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.

Series 394 meets the AISC requirements in accordance with RCSC Appendix A for Class B surface with a mean slip coefficient of no less than 0.50 and tension creep not in excess of 0.005 inches (0.13 mm). Contact Tnemec Technical Service for more information. Note: Using other products as primers or topcoats voids AISC requirements. Contact your Tnemec representative for specific recommendations.

Series 394 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.

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Unthinned: 1.73 lbs/gal solids
Thinned 10% (No. 2 Thinner): 2.91 lbs/gal solids
Thinned 10% (No. 3 Thinner): 1.78 lbs/gal solids
Thinned 10% (No. 49 Thinner): 1.73 lbs/gal solids

Number of Components


Volatile Organic Compounds

Unthinned: 2.00 lbs/gallon (240 grams/litre)
Thinned 10% (No. 2 Thinner): 2.55 lbs/gallon (306 grams/litre)
Thinned 10% (No. 3 Thinner): 2.55 lbs/gallon (306 grams/litre)
Thinned 10% (No. 49 Thinner): 2.00 lbs/gallon (240 grams/litre)

Theoretical Coverage

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


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

Curing Time

Without 44-710

| Temperature †|| To Touch || To Handle || To Topcoat |
| 75°F (24°C) || ¼ hour || 1 ½ hours || 16 hours |
| 65°F (18°C) || ¼ hour || 2 ¾ hours || 16 hours |
| 55°F (13°C) || ¼ 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).
Note: The use of Series 44-710 can greatly reduce dry to handle cure times. Series 44-710 Accelerator must be used when the surface temperature falls below 50°F (10°C).


Series 21, 27, 66, L69, L69F, N69, N69F, 73, 113, 114, 115, V115, 161, 971, 975, 1026, 1028, 1029, 1094, 1095, 1096, 1224.
Note: If Series 394 is exterior exposed for one 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 three days or longer and Series 113 is the specified topcoat. Note: Series 115 and V115 require the use of Series 44-900 adhesion promoter when topcoating Series 394. Note: Certain topcoat colors may not provide one coat hiding depending on the method of application. Contact your Tnemec representative. Note: Series 394 must be exterior exposed for one day prior to topcoating with Series 1224 or three days prior to topcoating with Series 1028 or 1029.

Recommended DFT

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

Volume Solids

61.0 ± 2.0% (mixed)

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