Seymour 16-845 Primer, Spray Weld Through – Cold Galvanizing Primer for Metal & Wood

Seymour 16-845 Primer, Spray Weld Through is a cold galvanizing primer designed to deliver durable zinc protection during priming and welding. The dried film contains 86 percent Type I inorganic zinc, helping resist oxidation and preserving galvanizing even if the coating is scratched. It dries quickly on metal and wood, creating a robust base coat that can be topcoated for maximum durability. This primer meets or exceeds key performance standards, making it a practical choice for projects that demand reliable corrosion resistance without sacrificing work efficiency.

In addition to its zinc rich chemistry, 16-845 includes an additive that can reduce welding smoke and electrode wear, potentially supporting smoother, faster welds compared to other zinc rich coatings. The formulation leans toward environmental responsibility by offering waterborne and high solids resin options as alternatives to traditional solvent based polymers. Importantly, Seymour products do not contain lead, cadmium, mercury, chromates or chlorinated solvents, aligning with broader health and environmental considerations typical of modern shop practices.

Why choose Seymour 16-845 Primer

• 86 percent Type I inorganic zinc in the dried film for strong zinc protection
• Fast drying surface that supports quick workflow
• Excellent adhesion for a durable finishing coat
• Flexible and sandable for a smooth topcoat interface
• Works on metal and wood, expanding priming options
• Free of lead, cadmium, mercury, chromates and chlorinated solvents

Key specifications and standards

• Topcoatable for maximum durability
• Meets or exceeds ASTM A780, MIL-P-26915C, MIL-P-46105, DOD-P-21035A, SSPC-Paint 20
• Low smoke additive may reduce welding byproducts and electrode wear
• Environmentally conscious formulation with waterborne and high solids resins

Real world uses and benefits

This primer is designed for use on prepared metal and wood surfaces where a galvanized base is desired before applying topcoats. Its zinc rich film aims to provide durable protection in environments where oxidation is a concern. The spray application supports efficient coverage on larger components or intricate joints, while the flexible finish helps accommodate minor substrate movement without cracking. Priming with 16-845 can be part of a faster workflow in repair or retrofit projects where weld through capability is beneficial, offering a practical balance of protection and productivity.

Overall, Seymour 16-845 Primer offers a combination of strong zinc protection, fast operation, and responsible formulation. While results may vary with project conditions, this primer provides a solid base option for metal and wood surfaces that will be topcoated later in the process.