US Chemical & Plastics
USC 12-4 Fast Activator, 1 qt Liquid, 4:1 Mix Ratio for Urethane Clearcoat
No reviews yet
Hazardous material · Liquid
Liquid hazmat ships ground-only via UPS/FedEx with a per-item carrier surcharge applied at checkout.
Shipping restrictions apply
Ground freight only (UPS/FedEx). Cannot ship via Air, USPS, or to PO boxes. APO/FPO addresses excluded.
WARNING: Cancer & Reproductive Harm
California Pro65 Warning: Cancer and Reproductive Harm
Tap for details → P65Warnings.ca.gov
Authorized dealer
Ships today
30-day returns
Overview
Built for the booth.
A competitively-priced clearcoat that offers body shops a quality finish. With a 4:1 mix ratio, this clearcoat is easy-to apply and ideal for use on spot, panel, multi-panel and overall refinishing.
USC® 12‑4 Fast Activator is a 1‑qt liquid activator formulated for use with US Chemical’s 10 Universal 4.2 VOC urethane clearcoat. It is mixed at a 4 parts activator to 10 parts clearcoat ratio to initiate rapid cross‑linking, delivering a fast, consistent cure for automotive refinishing applications.
The activator provides a pot life of 2‑4 hours at 72 °F (22 °C), allowing ample working time while maintaining a quick flash and cure schedule. At a film thickness of 1.0 mil it covers approximately 480 sq ft, making it efficient for large panels. It is compatible with e‑coat and plastic substrates, ensuring reliable adhesion and finish quality on a range of factory‑prepped surfaces.
Due to its classification as a Warning‑level hazardous material, appropriate personal protective equipment—including eye protection, gloves, protective clothing, and a respirator—must be worn. Use in a well‑ventilated area and follow standard first‑aid procedures for inhalation, skin, and eye exposure.
Why Pros Choose US Chemical & Plastics Fast
- A competitively-priced clearcoat that offers body shops a quality finish. With a 4:1 mix ratio, this clearcoat is easy-to apply and ideal for use on spot, panel, multi-panel and overall refinishing.
Application Guide
- Clean the substrate (e‑coat or plastic) to remove all contaminants; ensure the surface is dry and free of oil.
- Mix USC® 12‑4 Fast Activator with 10 Universal 4.2 VOC Urethane Clearcoat at a ratio of 1 part activator to 4 parts clearcoat.
- Apply the mixed clearcoat using the recommended spray technique; work within the 2–4 hour pot life at 72 °F (22 °C).
- Allow each coat to flash and dry according to the clearcoat’s specifications before applying additional coats.
Compatibility
Compatible paint systems: Urethane, Clearcoat.
Specifications
| Part No. | 12-4 |
|---|---|
| Product Line | USC |
| MFR Model | 12-4 |
| Standard/Approvals | California Pro65 Warning: Cancer and Reproductive Harm |
| Manufacturer | US Chemical & Plastics |
| UPC | 037307001249 |
| Brand | USC® |
| Maximum Sale Quantity | 12 |
| Maximum Sale Day | 7 |
| Rubberized | No |
| Color | Clear |
| Container Size (qt) | 1 |
| Form | Liquid |
| Type | Fast |
| Mixing Ratio | 4:1 |
- Mix Ratio
- 4 parts 10 clearcoat
- Pot Life
- 2‑4 hours @ 72°F / 22°C
- Coverage
- 480 sq ft @ 1.0 mil
- Compatible Substrates
- e‑coat, plastic
About US Chemical & Plastics
US Chemical & Plastics 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 substrates are compatible with USC® 12-4 Fast Activator?
It is formulated for use on e‑coat and plastic substrates.
How much coverage does the activator provide?
One quart covers approximately 480 sq ft at a 1.0 mil film thickness when mixed with the recommended clearcoat.
What personal protective equipment is required when handling this product?
Wear eye protection, chemical‑resistant gloves, protective clothing, and a respirator suitable for organic vapors.
What is the pot life of the mixed system?
After mixing with the 10 Universal 4.2 VOC urethane clearcoat at a 4:1 ratio, the pot life is 2–4 hours at 72 °F (22 °C).
Documents & Safety
Warning: This activator is toxic if inhaled or swallowed, can cause serious eye injury, skin corrosion, and is flammable. It is also classified as a carcinogen, organ toxin, respiratory irritant, reproductive hazard, and oxidizer. Use eye protection, chemical‑resistant gloves, protective clothing, and a suitable respirator when handling. Keep the product away from heat, sparks, and open flame. 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 US Chemical & Plastics USC in a 1 (QT) container. Check the autofxmart catalog for other sizes and bulk pricing.
US Chemical & Plastics USC uses a mix ratio of 4:1. 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 US Chemical & Plastics USC 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 US Chemical & Plastics 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 US Chemical & Plastics USC is 12-4. Use this number when cross-referencing against TDS, SDS, or legacy supplier catalogs.
What Our Customers Say
Thanks! Your review was submitted and will appear after moderation.
No reviews yet — be the first to review this product.
