Duramix By Seymour
Duramix By Seymour Duramix High-Build Self Leveling Seam Sealer (7 oz.)
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Overview
Built for the booth.
A controlled flow seam sealer designed for horizontal seams requiring a flowable type sealer.
The DURAMIX 1420 High-Build Self Leveling Seam Sealer is a professional-grade two-component adhesive designed for filling and sealing panel joints, seams, and gaps in automotive collision repair. This 7 oz. cartridge system features a convenient 1:1 mix ratio for consistent application without complex measuring or mixing procedures.
With a 20-30 minute work time and 60-minute sandable time, this sealer provides efficient workflow for high-volume shop operations. The formula cures completely in 6-8 hours and is paintable after 60 minutes, allowing same-day completion of repair cycles. Compatible with aluminum, bare metal, OEM finishes, primer, and steel substrates, it bonds effectively across multiple surface types commonly encountered in collision repair work.
The self-leveling properties ensure smooth, professional results that minimize finishing work. Always use appropriate respiratory protection and ensure adequate ventilation when applying this product in enclosed work areas.
Why Pros Choose Duramix By Seymour DMX
- Working Time: 20 to 30 min.
- Handling Time: 30 to 45 min
- Sandable Time: 60 min
- Paintable Time: 60 min.
- Full Cure Time: 6 to 8 hours
Application Guide
- Prepare substrate by cleaning aluminum, bare metal, steel, OEM finish, or primer surface of contaminants and debris.
- Mix sealer at 1:1 ratio and use within 20-30 minute work time.
- Apply sealer to seam areas, allowing self-leveling properties to create smooth finish.
- Allow 30-45 minutes handling time before disturbing application.
- Sand after 60 minutes if surface preparation is needed.
- Apply primer or topcoat after 60 minutes paintable time.
- Allow 6-8 hours for full cure before final finishing operations.
Specifications
| Part No. | 1420 |
|---|---|
| Product Line | DMX |
| Manufacturer | DURAMIX BY SEYMOUR |
| UPC | 043281010818 |
- Mix Ratio
- 1:1
- Work Time
- 20-30 minutes
- Handling Time
- 30-45 minutes
- Sandable Time
- 60 minutes
- Paintable Time
- 60 minutes
- Cure Time
- 6-8 hours
- Compatible Substrates
- Aluminum, bare metal, OEM, primer, steel
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 adheres to aluminum, bare metal, OEM finishes, primer, and steel substrates. Clean and prepare surfaces according to standard body shop practices before application.
How long does it take to cure and when can I sand it?
Full cure time is 6-8 hours. The sealer becomes sandable in 60 minutes, allowing you to proceed with bodywork relatively quickly.
What's the working time after mixing?
You have 20-30 minutes of work time after mixing the 1:1 ratio components. Plan your application accordingly to avoid waste.
When can I apply primer or paint over this sealer?
The sealer is paintable after 60 minutes. This matches the sandable time, so you can sand and apply topcoats in the same timeframe.
How long before I can handle the repaired area?
Allow 30-45 minutes handling time before moving or manipulating the sealed area to avoid disturbing the cure process.
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
20-30 Minutes
Handling
30-45 Minutes
Paintable
60 Minutes
Sandable
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 1420. Use this number when cross-referencing against TDS, SDS, or legacy supplier catalogs.
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