Duramix By Seymour
Duramix By Seymour Duramix Heavy Bodied Seam Sealer — White (7 oz.)
No reviews yet
Authorized dealer
Ships today
30-day returns
Overview
Built for the booth.
A high viscosity direct to metal seam sealer designed for sealing horizontal and vertical voids, joints and seams.
DURAMIX BY SEYMOUR 1380 Heavy Bodied Seam Sealer is a professional-grade, two-component urethane sealer designed for automotive seam sealing applications. This white-colored sealer provides excellent adhesion and flexibility for restoring factory seam integrity on collision repairs, panel replacements, and bodywork restoration projects.
The 1:1 mix ratio ensures consistent application and eliminates mixing errors, while the 10-15 minute work time allows sufficient open time for proper tooling and finishing. With a handling time of 30-45 minutes and full cure in 6-8 hours, this sealer accommodates efficient workflow scheduling. The formula adheres to multiple substrates including aluminum, bare metal, e-coat, fiberglass, FRP, OEM finishes, primer, and SMC, making it suitable for diverse repair scenarios across different vehicle types and materials.
Why Pros Choose Duramix By Seymour DMX
- Working Time: 10 to 15 min.
- Handling Time: 30 to 45 min
- Sandable Time: 45 min
- Paintable Time: Immediately
- Full Cure Time: 6 to 8 hours
Application Guide
- Clean substrate thoroughly to remove dirt, oil, and loose debris. Ensure surface is dry before application.
- Mix sealer at 1:1 ratio. Use mixed product within 10-15 minutes work time.
- Apply sealer to seam areas using appropriate dispensing tool. Work quickly to complete application before work time expires.
- Allow 30-45 minutes handling time before moving parts or applying additional materials.
- Allow 6-8 hours full cure time before sanding or topcoating.
Specifications
| Part No. | 1380 |
|---|---|
| Product Line | DMX |
| Manufacturer | DURAMIX BY SEYMOUR |
| UPC | 043281010788 |
- Mix Ratio
- 1:1
- Work Time
- 10-15 minutes
- Handling Time
- 30-45 minutes
- Cure Time
- 6-8 hours
- Compatible Substrates
- Aluminum, bare metal, e-coat, fiberglass, FRP, OEM primer, SMC
About Duramix By Seymour
Duramix By Seymour is a trusted manufacturer of professional auto body and refinish products used by collision repair shops and restoration specialists across North America.
Frequently Asked Questions
What surfaces can I use this seam sealer on?
This seam sealer is compatible with aluminum, bare metal, e-coat, fiberglass, FRP, OEM finishes, primer, and SMC substrates.
How long does it take to fully cure?
The seam sealer cures completely in 6-8 hours under normal conditions.
What's the working time after mixing?
You have 10-15 minutes of work time after mixing the 1:1 ratio components before the material becomes difficult to apply.
When can I handle the sealed area?
The seam sealer reaches handling strength in 30-45 minutes, allowing for careful movement or positioning of parts.
What's the mix ratio for this product?
Mix equal parts base and activator at a 1:1 ratio by volume for proper cure and performance.
Documents & Safety
Why Buy from autofxmart
- Authorized distributor — authentic, factory-fresh stock.
- Fast US shipping — most orders ship within 1 business day.
- 30-day returns — buy with confidence.
- Pro-shop pricing — bulk discounts available on request.
- Expert support — questions? Email us at support@autofxmart.com.
Cure & dry schedule
Timing at 77°F
Work Time
10-15 Minutes
Paintable
Immediately
Handling
30-45 Minutes
Sandable
45-60 Minutes
Full Cure
6-8 Hours
How to apply
Steps
1Clean both surfaces to bare, dry substrate.
2Load the cartridge and fit the mixing nozzle.
3Apply an even bead (or clamp) where needed.
4Tool or smooth the joint before it skins over.
5Allow to cure fully before stressing or painting.
Specifications
Full data
Frequently asked
Good to know
Most in-stock orders for DURAMIX BY SEYMOUR DMX ship the same or next business day from our US warehouse. Expedited options are available at checkout. Freight-class items may require an additional 1–2 days for carrier pickup.
Yes. autofxmart is an authorized distributor of DURAMIX BY SEYMOUR products. Every unit is factory-fresh, sealed, and backed by the manufacturer's standard warranty. If you have a concern, contact support@autofxmart.com and we will make it right.
The MPN for DURAMIX BY SEYMOUR DMX is 1380. Use this number when cross-referencing against TDS, SDS, or legacy supplier catalogs.
What Our Customers Say
Thanks! Your review was submitted and will appear after moderation.
No reviews yet — be the first to review this product.
