Duramix™ Medium Bodied Seam Sealer—Gray (7 oz)

Seymour Duramix™ Gray Medium Bodied Seam Sealer Product Details

When it comes to coatings and adhesives, Seymour doesn’t just set the bar—we built it. A trusted name in industrial and automotive repair since the mid-1960s, we’ve spent decades creating solutions that outperform and outlast.

Our Medium Bodied Seam Sealer—part of our Duramix™ product line—is a pro-grade essential. It’s engineered to fill voids, seal joints, and bond seams with precision and durability. It applies directly to metal, easily replicates OEM textures, and cures fast to keep you moving.

No matter the project, our automotive seam sealer delivers clean results and serious staying power. When it counts, you can count on Seymour.

Duplicates OEM Seams with Ease

Duramix™ Gray Medium Bodied Seam Sealer is built to help you achieve that factory-fresh appearance. It is specially formulated to replicate the fine and intricate seam patterns and textures in OEM applications.

A little tape or a door skin nozzle is all you need to lay down clean, consistent beads across hoods, trunks, and more. If you’re chasing precision with a side of speed, this is the seam sealer the most demanding repair technicians swear by.

Quick Cure. Instant Topcoat!

You know it. We know it. Time is money! And Seymour Duramix™ Gray Medium Bodied Seam Sealer saves you both. Our automotive seam sealer offers a 15- to 20-minute working time, a 20- to 30-minute handling time, and is sandable in just 45.

Better yet? It’s paintable immediately. No long waits. No productivity bottlenecks.

Designed to Work Direct to Metal—No Primer? No problem.

As an epoxy-based formula, this seam sealer offers superior adhesion to bare steel and aluminum, making it a reliable choice for a wide range of metal surfaces. It sticks straight to bare metal, primed surfaces, and more, with no need for additional primers or prep coatings. But if you want to go the extra mile—especially on aluminum or for OEM alignment—you’ll get even better results by priming bare metal surfaces with a 2K epoxy primer.

Either way, you know Seymour’s got your back—and that means results you can trust.

Manual or Spray Application—Seam Sealing Your Way!

Apply it by hand or spray it on! Our automotive seam sealer adapts to your needs. Use the Duramix™ 2K Cartridge Gun for precise manual control, or switch to a sprayable setup with the Duramix™ 2K Quick Spray System Kit. Whether you’re smoothing out tight corners or running long beads, Duramix™ products deliver flexibility and control.

Works Where You Need It To, aka Substrates

Our Duramix™ Gray Medium Bodied Seam Sealer features an epoxy formulation that grips confidently to both metal and composite surfaces found in automotive repair and restoration:

• Bare metal
• Primed metal
• OEM e-coat
• Aluminum
• SMC (Sheet Molded Compound)
• FRP (Fiber-Reinforced Plastic)
• Fiberglass

Suggested Uses for Seymour’s Duramix™ Gray Medium Bodied Seam Sealer

Seymour Duramix™ Medium Bodied Seam Sealer delivers clean lines and lasting hold. Perfect for:

• Door skins
• Hoods
• Trunks
• Car body panel restoration
• Auto body joint & seam repairs
• Replicating factory-style OEM textures
• General restoration & collision repair 

Made in the USA.