US Chemical & Plastics
USC 43-4 Medium Activator 1 qt Liquid 4:1 Mix - Use with 40 4.2 VOC Glamour Clearcoat
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Hazardous material · Liquid
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WARNING: Cancer & Reproductive Harm
California Pro65 Warning: Cancer and Reproductive Harm
Tap for details → P65Warnings.ca.gov
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Overview
Built for the booth.
A premium glamour clearcoat that delivers on performance, durability and appearance. Recommended two coat coverage results in a beautiful high-gloss finish. National rule compliant.
USC® 43-4 Medium Activator is a 1 qt liquid hardener formulated for use with US Chemical & Plastics 40 4.2 VOC Glamour Urethane Clearcoat. It provides the catalyst needed to achieve full cure of the urethane clearcoat in professional body shop applications.
Mixed at a 4:1 ratio, the activator delivers a pot life exceeding five hours at 78 °F (25.6 °C), allowing ample working time for large panels. Flash time between coats is 8-10 minutes at 72 °F (22 °C), supporting efficient multi-coat schedules. One quart covers approximately 610 sq ft (1.0 mil dry film) with a solids content of 45 %, and it is compatible with e-coat and plastic substrates, ensuring reliable adhesion on common automotive finishes.
Handling requires standard PPE: eye protection, chemical-resistant gloves, protective clothing, and a respirator in confined spaces. The product carries a "Warning" signal word and multiple GHS hazards, so adequate ventilation and immediate first-aid measures for inhalation, skin, or eye exposure must be observed.
Why Pros Choose US Chemical & Plastics USC
- Two coat coverage
Application Guide
- Ensure the substrate (e-coat or plastic) is clean, dry, and free of contaminants.
- Mix USC® 43-4 Medium Activator with 40 4.2 VOC Glamour Urethane Clearcoat at a 4:1 ratio by volume.
- The mixed material has a pot life of greater than 5 hours at 78 °F (25.6 °C); work within this window.
- Apply the clearcoat/activator blend using the recommended spray technique; apply each coat uniformly.
- Allow a flash time of 8-10 minutes between coats when ambient temperature is 72 °F (22 °C).
- Continue applying additional coats as required, observing the same flash interval.
Compatibility
Compatible paint systems: Urethane, Clearcoat.
Specifications
| Part No. | 43-4 |
|---|---|
| Product Line | USC |
| MFR Model | 43-4 |
| Standard/Approvals | California Pro65 Warning: Cancer and Reproductive Harm |
| Manufacturer | US Chemical & Plastics |
| UPC | 037307004349 |
| Brand | USC® |
| Rubberized | No |
| Container Size (qt) | 1 |
| Form | Liquid |
| Mixing Ratio | 4:1 |
- Mix Ratio
- 4:1
- Pot Life
- > 5 hours @ 78 °F / 25.6 °C
- Flash Time
- 8-10 min between coats @ 72 °F / 22 °C
- Coverage
- 610 sq ft @ 1.0 mil (solids 45.0%)
- 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® 43-4 Medium Activator?
The activator can be used on e-coat and plastic surfaces.
What is the recommended mix ratio for this activator?
Mix the activator at a ratio of 4 parts activator to 1 part clearcoat.
How long does the pot life last after mixing?
The mixed system provides more than 5 hours of pot life when held at 78 °F (25.6 °C).
What is the flash time between coats?
Allow 8-10 minutes between coats at 72 °F (22 °C) before applying the next layer.
What coverage can I expect from one quart?
One quart covers approximately 610 sq ft at a film thickness of 1.0 mil (45 % solids by weight).
What personal protective equipment is required when handling this product?
Wear eye protection, chemical-resistant gloves, protective clothing, and a respirator as indicated on the SDS.
Documents & Safety
Warning - This medium activator is toxic if inhaled or swallowed, can cause serious eye damage and skin corrosion, and is a fire hazard. It also poses long-term risks such as carcinogenicity, organ toxicity, respiratory irritation, and reproductive effects. Wear appropriate personal protective equipment: safety goggles or face shield, chemical-resistant gloves, full protective clothing, and a suitable respirator. 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.
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 43-4. Use this number when cross-referencing against TDS, SDS, or legacy supplier catalogs.
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