Duramix™ 2-in-1 1K Seam Sealer—White (10.1 oz)

Seymour Duramix™ 2-in-1 1K Automotive Seam Sealer Product Details

Seymour has been blazing the trail since 1949—and we’re not slowing down. Our Duramix™ White 1K Automotive Seam Sealer is a flexible, direct-to-metal solution designed to replicate OEM seams and sprayed textures without overcomplicating the job.

This one-component seam sealer is isocyanate-free, fast-curing, and can be tooled or sprayed, depending on your workflow. With immediate paintability and compatibility with resistance welding (STRSW), it’s engineered to meet real-world shop demands without sacrificing performance.

Use it on door skins, hoods, trunks, or even to secure sound-dampening pads. Duramix™ products are built to work as hard as you do.

OEM Finish Without the Guesswork

Seymour Duramix™ 1K seam sealer makes it easy to replicate factory looks without the factory hassle. It can even be used to duplicate OEM sprayed undercarriage seam sealer for a clean, consistent finish underneath it all.

It’s color-matched to OEM standards and pairs perfectly with other Duramix™ products. So, whether you’re sealing hoods, panels, or pads, you get consistent, OEM results every time.

Ready When You Are—Fast Dry, Paint Now!

Our Duramix™ 2-in-1 White 1K Automotive Seam Sealer doesn’t make you wait. With a 20-minute working time, 2-hour handling time, and no wait time before painting, it’s ready to move when you are.

Depending on application thickness, it fully cures within 48 hours and remains permanently flexible without shrinking or cracking. This stellar seam sealer is ideal for high-turnover jobs where quality still matters.

Built for Body Shops—Direct to Metal, Weld-Safe & Isocyanate-Free

Duramix™ 1K Auto Seam Sealer was made for the real-world conditions of the shop floor. It applies directly to metal—no primer required—and is fully safe for use with resistance spot welding (STRSW). For those who want to dial in a true OEM finish, especially on aluminum, priming bare metal with a 2K epoxy primer will give you the best possible foundation.

Did we mention it’s 100% isocyanate-free? That makes our seam sealer safer to use without compromising strength or flexibility! Fewer steps, fewer hazards, and first-rate performance from start to finish.

Works Where You Need It To, aka Substrates

Our Duramix™ 1K Auto Seam Sealer bonds strong to a variety of materials:

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

Suggested Uses for Seymour’s Duramix™ White 1K Automotive Seam Sealer

Seymour Duramix™ 2-in-1 1K Automotive Seam Sealer is built to tackle a wide range of auto body repairs and specialty applications, including:

• Door skins
• Hoods
• Trunks
• Sound-dampening pads
• Undercarriages
• Car & truck body panels
• Replicating OEM beads & textures

Made in the USA.