Overview
Built for the job.
Low VOC Rubberized Undercoating is a premium, easy to apply, paintable, asphalt-free coating for sound dampening, chip resistance, rust and corrosion protection. Aerosol offers the dual texture formula to produce two distinct textures, heavy or light.
SEM® 40523 Rubberized Undercoating is a low‑VOC, aerosol‑delivered coating formulated for protecting chassis, floor pans, and other exposed metal surfaces from rust, corrosion, and impact damage. The 24 oz black spray provides a flexible, rubberized film that adheres to a range of substrates commonly found in body shop repairs.
Technical data shows a VOC content of 455 g/L (3.79 lb/gal) and compatibility with aluminum, fiberglass, SMC, and steel. The product is stored in a cool, dry environment to preserve its performance. Its flash point of –103 °C classifies the aerosol as a flammable compressed gas, requiring strict handling controls.
Safe application mandates the use of eye protection, chemical‑resistant gloves, protective clothing, and a respirator. Adequate ventilation is essential, and users must follow H‑statements H222, H280, H304, H315, H319, H335, H336, and H351 for handling, storage, and disposal.
Why Pros Choose SEM SEM
- Dual texture formula
- 5 state compliant
- Hot and humid climate friendly
- Paintable without bleed-through
- Pinhole free
- 1 percent asphalt free
- Sound dampering properties help reduce road noise
- Chip and corrosion resistant
- Uniform final appearance
- Aerosol includes straw for tight spots
How to Use
For use on properly prepped and primed surfaces, steel, aluminum, SMC and fiberglass
Specifications
| Part No. | 40523 |
|---|---|
| Product Line | SEM |
| MFR Model | 40523 |
| Standard/Approvals | California Pro65 Warning: Cancer and Reproductive Harm |
| Application | For use on properly prepped and primed surfaces, steel, aluminum, SMC and fiberglass |
| Manufacturer | SEM |
| UPC | 646786405235 |
| Brand | SEM® |
| Maximum Sale Quantity | 6 |
| Maximum Sale Day | 7 |
| Color | Black |
| Container Size (oz) | 24 |
- VOC
- 455 g/L (3.79 lb/gal)
- Shelf Life
- Store in a cool, dry place
- Compatible Substrates
- Aluminum, fiberglass, SMC, steel
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 can SEM® 40523 Rubberized Undercoating be applied to?
It is compatible with aluminum, fiberglass, SMC (sheet‑molded compound), and steel.
What personal protective equipment is required when applying this undercoating?
Use eye protection, chemical‑resistant gloves, protective clothing, and a respirator suitable for aerosol sprays.
Is there any special storage requirement for the product?
Store in a cool, dry place to maintain shelf life.
Documents & Safety
- Safety Data Sheet (SDS)
- sem_40523_specification_sheet.pdf
- 40523%20Low%20VOC%20Rubberized%20UndercoatingUSA.pdf
Danger: This aerosol is highly flammable and toxic. Wear safety goggles, chemical‑resistant gloves, protective clothing, and a suitable respirator. The spray can cause serious eye injury, skin burns, respiratory irritation, and may be harmful if swallowed or inhaled; it is also classified as a carcinogen and toxic to aquatic life. Use in a well‑ventilated area and keep away from heat sources. 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
This listing ships SEM in a 24 (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 40523. Use this number when cross-referencing against TDS, SDS, or legacy supplier catalogs.
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