Duramix By Seymour
Duramix By Seymour Duramix Medium Bodied Seam Sealer — Gray (7 oz.)
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Overview
Built for the booth.
A medium viscosity direct to metal seam sealer for sealing voids, joints and seams.
DURAMIX BY SEYMOUR 1350 Medium Bodied Seam Sealer provides reliable sealing and corrosion protection for welded joints and panel seams in automotive collision repair. This gray sealer delivers consistent viscosity for smooth application while maintaining flexibility after cure to accommodate normal vehicle movement and thermal expansion.
Mixed at a convenient 1:1 ratio, the sealer offers a 15-20 minute work time with full cure achieved in 6-8 hours. The versatile formulation bonds to aluminum, bare metal, e-coat, fiberglass, FRP, OEM finishes, primer, and SMC substrates, making it suitable for mixed-material repairs. Handling time of 20-30 minutes allows for repositioning and cleanup while maintaining proper adhesion to prepared surfaces.
Apply in well-ventilated areas and use appropriate personal protective equipment including gloves and eye protection. Surface preparation according to substrate requirements ensures optimal adhesion and long-term durability of sealed joints.
Why Pros Choose Duramix By Seymour DMX
- Working Time: 15 to 20 min.
- Handling Time: 20 to 30 min
- Sandable Time: 45 min
- Paintable Time: Immediately
- Full Cure Time: 6 to 8 hours
Application Guide
- Prepare substrate by cleaning aluminum, bare metal, e-coat, fiberglass, FRP, OEM primer, or SMC surfaces to ensure proper adhesion
- Mix seam sealer at 1:1 ratio immediately before use - work time is limited to 15-20 minutes after mixing
- Apply medium bodied sealer to seam areas using appropriate dispensing method, working quickly within the 15-20 minute work time
- Allow 20-30 minutes handling time before moving parts or applying additional materials
- Allow full cure for 6-8 hours before final sanding or topcoat application
Specifications
| Part No. | 1350 |
|---|---|
| Product Line | DMX |
| Manufacturer | DURAMIX BY SEYMOUR |
| UPC | 043281010757 |
- Mix Ratio
- 1:1
- Work Time
- 15-20 minutes
- Handling Time
- 20-30 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 medium bodied seam sealer adheres to aluminum, bare metal, e-coat, fiberglass, FRP, OEM finishes, primer, and SMC substrates, making it suitable for most common automotive repair applications.
How long does it take to fully cure?
The sealer requires 6-8 hours for complete cure. You'll have 20-30 minutes of handling time before it becomes difficult to work with.
What's the working time after mixing?
Once mixed at the 1:1 ratio, you have 15-20 minutes of work time to apply the sealer before it begins to set up.
What mixing ratio should I use?
Mix this seam sealer at a 1:1 ratio for proper curing and performance characteristics.
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
15-20 Minutes
Handling
20-30 Minutes
Paintable
Immediately with solvent based coatings, 15 Minutes with waterborne basecoat
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 1350. Use this number when cross-referencing against TDS, SDS, or legacy supplier catalogs.
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