US Chemical & Plastics
USC 2815-4 Activator 1 qt Liquid, Mix Ratio 4:1, for 2K Urethane Primer Surfacer
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 production-centric primer surfacer that builds, dries and sands fast and easy.
USC® 2815-4 Activator is a liquid hardener formulated for use with US Chemical & Plastics 2K urethane primer surfacer. It is applied at a mix ratio of four parts primer to one part activator, providing the chemical cure needed for high-performance urethane coatings in collision repair.
The activator delivers a pot life of up to two hours when mixed at 75 °F and 50 % relative humidity, giving technicians ample working time on complex panels. It achieves an estimated coverage of 5.12 sq ft per US gallon of mixed material and is compatible with plastic substrates and previously applied primer layers, ensuring consistent film build and adhesion.
Handling requires standard PPE: eye protection, chemical-resistant gloves, protective clothing, and a respirator in well-ventilated areas. The product carries a "Warning" signal word and lists acute toxicity, aspiration hazard, carcinogenicity, flammability, and skin corrosion among its GHS hazards, so proper ventilation and decontamination procedures must be followed.
Why Pros Choose US Chemical & Plastics USC
- A production-centric primer surfacer that builds, dries and sands fast and easy.
Application Guide
- Mix USC® 2815-4 Activator with the 2K urethane primer surfacer at a ratio of 4 parts primer to 1 part activator.
- Work within the 2-hour pot life (measured at 75 °F / 50 % RH) to ensure optimal reactivity.
- Apply the mixed material uniformly to the prepared substrate (plastic or primed surface). Coverage is approximately 5.12 sq ft per US gallon; adjust spray volume accordingly.
Compatibility
Compatible paint systems: Urethane, 2K.
Specifications
| Part No. | 2815-4 |
|---|---|
| Product Line | USC |
| MFR Model | 2815-4 |
| Standard/Approvals | California Pro65 Warning: Cancer and Reproductive Harm |
| Manufacturer | US Chemical & Plastics |
| UPC | 037307890874 |
| Brand | USC® |
| Rubberized | No |
| Container Size (qt) | 1 |
| Form | Liquid |
| Mixing Ratio | 4:1 |
- Mix Ratio
- 4 parts 2820 2K urethane primer surfacer
- Pot Life
- 2 hours @ 75 °F / 50 % RH
- Coverage
- 5.12 sq ft per US gallon
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® 2815-4 Activator?
It is approved for use on plastic and primed surfaces.
How much area does one quart of the activator cover?
The product provides approximately 5.12 sq ft per US gallon; a quart (¼ gal) will cover roughly 1.28 sq ft.
What personal protective equipment is required when handling this activator?
Use eye protection, chemical-resistant gloves, protective clothing, and a respirator as specified in the SDS.
What is the pot life of the mixed system?
The mixed primer/activator has a pot life of about 2 hours at 75 °F (24 °C) and 50 % relative humidity.
What is the recommended mix ratio for this activator?
Mix 4 parts of USC® 2820 2K urethane primer surfacer with the activator as specified by the manufacturer.
Documents & Safety
Warning: This activator is toxic if inhaled or swallowed, may cause cancer, severe eye damage, skin corrosion, and respiratory irritation. It is also flammable, an oxidizer, and can affect organs, reproductive health, and the nervous system. Wear appropriate personal protective equipment-including safety glasses or a face shield, chemical-resistant gloves, protective clothing, and a suitable respirator-when handling. 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 2815-4. 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.
