Overview
Built for the job.
Self etching primer provides excellent adhesion and corrosion resistance to properly prepped steel, aluminum and stainless steel.?
SEM® 39693 Self‑Etching Primer is a 20‑oz aerosol formulated for corrosion‑resistant priming of metal panels in collision repair. Designed for rapid flash cycles, it provides a reliable base coat before topcoat application on aluminum, steel, and previously primed surfaces.
Key performance features include a flash time of 5–10 minutes between coats and a recommended four‑coat build for full coverage. The low‑VOC formulation (648 g/L) meets stringent emissions standards while delivering consistent adhesion on treated substrates. The aerosol delivery ensures uniform atomization and easy application in shop environments.
Use in a well‑ventilated area with appropriate respiratory protection. Required PPE includes eye protection, gloves, protective clothing, and a respirator. The product is classified with multiple GHS hazards (acute toxicity, skin corrosion, eye damage, flammable gas, etc.) and carries H‑statements H222, H280, H304, H315, H319, H336, H340, and H350.
Why Pros Choose SEM SEM
- Excellent adhesion to steel, aluminum and stainless steel
- Quick drying
How to Use
For bare steel, bare aluminum
- Clean the substrate (aluminum, steel, or previously primed surface) with a solvent or cleaning material that meets VOC regulations to remove grease, oil, and contaminants.
- Apply the first coat of SEM 39693 Self‑Etching Primer using spray equipment, maintaining a uniform film thickness.
- Allow 5–10 minutes flash time before applying the next coat.
- Repeat application for a total of four coats, observing the same flash time between each coat.
- After the final coat, clean spray equipment and any tools with a VOC‑compliant cleaning solvent.
Compatibility
Compatible substrates: Steel, Aluminum, Stainless.
Specifications
| Part No. | 39693 |
|---|---|
| Product Line | SEM |
| MFR Model | 39693 |
| Standard/Approvals | California Prop65 Warning: Cancer and Reproductive Harm | GHS02 | GHS04 | GHS07 | GHS08 | OSHA HCS Hazard | VOC Compliant |
| Application | For bare steel, bare aluminum |
| Manufacturer | SEM |
| UPC | 646786396939 |
| Brand | SEM® |
| Maximum Sale Quantity | 12 |
| Maximum Sale Day | 7 |
| Solids Content | 14% |
| Color | Green |
| Container Size (oz) | 20 |
- Flash Time
- 5 – 10 min between coats
- VOC
- 648 g/L (≈ 59.5 % by volume)
- Compatible Substrates
- Aluminum, steel, previously primed surfaces
- Number of Coats
- 4
- Cleanup
- Use cleaning materials compliant with VOC regulations
About SEM
SEM Products specializes in paint adhesion systems, flexible coatings, and plastic repair — the go-to choice for interior and trim refinishing.
Frequently Asked Questions
What substrates are compatible with SEM® 39693 Self‑Etching Primer?
The primer is formulated for aluminum, steel, and previously primed surfaces.
How long should I wait between coats?
Flash time is 5–10 minutes between coats under normal shop conditions.
What personal protective equipment is required when applying this aerosol?
Use eye protection, chemical‑resistant gloves, protective clothing, and a respirator as indicated on the SDS.
How many coats are recommended for proper coverage?
Four coats are recommended to achieve the intended performance.
Documents & Safety
- Safety Data Sheet (SDS)
- sem_39671_specification_sheet.pdf
- 39693%20Self%20Etching%20Primer%20GreenUSA.pdf
Signal word: Danger.
Required PPE: safety glasses or face shield, chemical‑resistant gloves, protective clothing (coveralls), and a suitable respirator for vapors.
Key hazards: The aerosol contains highly flammable vapors and toxic chemicals that can cause skin burns, serious eye injury, respiratory irritation, and may be harmful if swallowed or inhaled. It is a known carcinogen and may affect reproductive health and the environment.
Always refer to the full SDS before use.
Required PPE: safety glasses or face shield, chemical‑resistant gloves, protective clothing (coveralls), and a suitable respirator for vapors.
Key hazards: The aerosol contains highly flammable vapors and toxic chemicals that can cause skin burns, serious eye injury, respiratory irritation, and may be harmful if swallowed or inhaled. It is a known carcinogen and may affect reproductive health and the environment.
Always refer to the full SDS before use.
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.
How to apply
Steps
1Clean and degrease the surface, then scuff as needed.
2Mask off surrounding panels and trim.
3Mix to the product's ratio and strain.
4Apply 2–3 even coats, flashing between each.
5Let cure fully before sanding, buffing, or assembly.
Specifications
Full data
Frequently asked
Good to know
SEM is compatible with Steel, Aluminum, Stainless. Always ensure the surface is properly cleaned, degreased, and sanded before application to achieve the strongest adhesion and a professional finish.
This listing ships SEM in a 20 (CN) container. Check the autofxmart catalog for other sizes and bulk pricing.
Most in-stock orders for SEM 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 SEM 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 SEM is 39693. Use this number when cross-referencing against TDS, SDS, or legacy supplier catalogs.
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