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Organic Zinc Rich Primer

Last edit date: 10/28/2026

The following organic zinc-rich primers have been authorized for use when specifications require use of a commercial quality organic zinc-rich primer. Typical uses are structural steel undercoat, the repair of galvanized steel, minor touch-up on inorganic zinc-coated steel, application to threads on galvanized pipes, coating inside of bolt holes, and other cut edges of coated-steel products. Refer to Section 83-2.05B(4) and 91-2.02A of the Caltrans Standard Specifications. Aerosol cans shall not be used.

Manufacturer Product Name VOC, g/L Expiration DateBABA Act Information*
Carboline Company Carbozinc 859 360 9/2030Manufactured product, domestic source reported
PPG INDUSTRIES HQ SIGMAZINC 70 DOT 278 4/2029Unconfirmed
Sherwin Williams COROTHANE I GALVAPAC 1K 340 9/2030Manufactured product, domestic source reported
Sherwin-Williams Company Zinc clad III HS 100 100 9/2030Manufactured product, domestic source reported
Wasser Corporation MC-Zinc 100 100 7/2030Manufactured Product, 55% or higher cost and final assembly both in US
ZINGAMETALL BV ZINGA 350** 420 10/2031Manufactured Product, non-domestic

The organic zinc-rich primers must meet the volatile organic carbon (VOC) content restrictions of local Air Quality Management Districts in which they are applied. The information contained herein, shall not be used for advertising purposes, nor is it an endorsement by the California Department of Transportation (Caltrans).

Evaluation Criteria: Instructions on how material is placed on the Authorized Material List can be found in the Organic Zinc-Rich Primer, Authorization Requirements, and Acceptance Criteria.

**Authorized for contractor use only

Caltrans contact: Kirolos Kelada, chemistry.branch@dot.ca.gov

*Per definition in 2 CFR 184 and 23 CFR 635.410. Stakeholders should use this information in conjunction with corresponding Caltrans special provision section 6-1.04 to understand applicable requirement for the project.

The California Department of Transportation (Caltrans) is implementing statutory changes required by the Bipartisan Infrastructure Law -Build America, Buy America Act (BABA), as outlined in 2 CFR 184 and 23 CFR 635.410.

https://www.fhwa.dot.gov/construction/cqit/buyam.cfm