SEM
SEM 39221 Waterborne Flexible Primer, 1 gal Can, Black, RTU Mixing
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Overview
Built for the job.
Waterborne flexible primer is a waterborne flexible coating for priming urethanes, plastics and other similar substrates.
Why Pros Choose SEM
- Superior adhesion
- Excellent sealing properties
- VOC compliant and environmentally friendly
- High solids formula
- Topcoat with most refinish materials
- Sands easily
- Saves time and labor
- Ready to spray - no mixing
Compatibility
Compatible substrates: Plastic.
Compatible paint systems: Urethane, Waterborne.
Specifications
| Part No. | 39221 |
|---|---|
| Product Line | SEM |
| MFR Model | 39221 |
| Standard/Approvals | California Pro65 Warning: Cancer and Reproductive Harm | VOC Compliant |
| Manufacturer | SEM |
| UPC | 646786392214 |
| Brand | SEM® |
| Rubberized | No |
| Solids Content | 45.8% |
| Color | Black |
| Container Type | Can |
| Form | Liquid |
| Container Size (gal) | 1 |
| Mixing Ratio | RTU |
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 surfaces can SEM be used on?
SEM is compatible with Plastic. Always ensure the surface is properly cleaned, degreased, and sanded before application to achieve the strongest adhesion and a professional finish.
What size does SEM come in?
This listing ships SEM in a 1 (GL) container. Check the autofxmart catalog for other sizes and bulk pricing.
What is the mix ratio for SEM?
SEM uses a mix ratio of RTU. Always measure activators and reducers accurately to maintain film properties and pot life — deviating from the ratio can cause adhesion or curing problems.
How fast does autofxmart ship SEM?
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.
Is this SEM product genuine?
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.
What is the manufacturer part number (MPN) for SEM?
The MPN for SEM is 39221. Use this number when cross-referencing against TDS, SDS, or legacy supplier catalogs.
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
Flash
10 min
Tape-free
1 hr
Recoat
30 min
Full cure
24 hr
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 Plastic. 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 1 (GL) container. Check the autofxmart catalog for other sizes and bulk pricing.
SEM uses a mix ratio of RTU. Always measure activators and reducers accurately to maintain film properties and pot life — deviating from the ratio can cause adhesion or curing problems.
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.
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