US Chemical & Plastics
USC 71-4 Activator 1 qt Liquid for 70 2.1 VOC Hyper Clearcoat
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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
This product can expose you to chemicals known to the State of California to cause cancer and reproductive harm.Tap for details → P65Warnings.ca.gov
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Overview
Built for the booth.
A high production 2.1 VOC clearcoat ideal for one or two panel jobs; it can be polished and delivered same day for optimal production.
USC® 71-4 Activator is a liquid hardener formulated for use with US Chemical & Plastics 70 2.1 VOC Hyper Clearcoat. It is applied as the catalyst in a 4:1 mix ratio (four parts clearcoat to one part activator) to achieve a high-performance, low-VOC topcoat on e-coat and plastic substrates.
The system provides a pot life of 1-2 hours at 70 °F/21 °C, allowing ample working time for two coats. At a film thickness of 1.0 mil the mixture covers approximately 507 sq ft per quart, delivering consistent gloss and durability across large panels. The activator's chemistry promotes rapid flash time while maintaining adhesion on coated metal and polymer surfaces.
USC® 71-4 is classified with a "Warning" signal word and presents acute toxicity, inhalation, and skin hazards. Technicians must wear eye protection, chemical-resistant gloves, protective clothing, and a respirator in well-ventilated areas. Follow standard first-aid procedures for inhalation, skin, or eye exposure as outlined in the SDS.
Why Pros Choose US Chemical & Plastics USC
- A high production 2.1 VOC clearcoat ideal for one or two panel jobs; it can be polished and delivered same day for optimal production.
Application Guide
- Clean the substrate (e-coat or plastic) to remove dust, grease, and contaminants.
- Mix USC® 71-4 Activator with 70 2.1 VOC Hyper Clearcoat at a ratio of 1 part activator to 4 parts clearcoat.
- Work within the pot life of 1-2 hours (measured at 70 °F/21 °C).
- Apply the first coat to achieve approximately 0.5 mil thickness; allow the recommended flash time before proceeding.
- Apply a second coat to reach a total coverage of 507 sq ft @ 1.0 mil.
Compatibility
Compatible paint systems: Clearcoat.
Specifications
| Part No. | 71-4 |
|---|---|
| Product Line | USC |
| MFR Model | 71-4 |
| Manufacturer | US Chemical & Plastics |
| UPC | 037307890942 |
| Brand | USC® |
| Rubberized | No |
| Container Size (qt) | 1 |
| Form | Liquid |
| Mixing Ratio | 4:1 |
- Mix Ratio
- 4 parts 70 hyper clearcoat
- Pot Life
- 1 - 2 hours @ 70°F / 21°C
- Coverage
- 507 sq ft @ 1.0 mil
- Compatible Substrates
- e-coat, plastic
- Number of Coats
- 2
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 can I apply USC® 71-4 Activator to?
The activator is compatible with e-coat and plastic substrates.
How long do I have to work with the mixed product before it begins to cure?
The pot life after mixing is 1 - 2 hours at 70 °F (21 °C).
What personal protective equipment is required when using this activator?
Use eye protection, chemical-resistant gloves, protective clothing, and a respirator.
What is the coverage rate for USC® 71-4 Activator?
The product covers approximately 507 sq ft per quart at a film thickness of 1.0 mil.
How many coats of clearcoat should I apply after using the activator?
Apply two coats of the 70 2.1 VOC Hyper Clearcoat over the activated surface.
Documents & Safety
Signal word: Warning.
Required PPE: wear safety glasses or goggles, chemical-resistant gloves, protective clothing (coveralls), and a suitable respirator.
Key hazards: toxic if inhaled or swallowed, can cause serious eye injury and skin corrosion, is flammable and an oxidizer, may affect the respiratory system, organs, and reproductive health, and is classified as a carcinogen.
Always refer to the full SDS before use.
Required PPE: wear safety glasses or goggles, chemical-resistant gloves, protective clothing (coveralls), and a suitable respirator.
Key hazards: toxic if inhaled or swallowed, can cause serious eye injury and skin corrosion, is flammable and an oxidizer, may affect the respiratory system, organs, and reproductive health, and is classified as a carcinogen.
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 71-4. Use this number when cross-referencing against TDS, SDS, or legacy supplier catalogs.
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