Overview
Built for the booth.
HIT.7421 Medium Activator is to be used with HIT.7420 primer Series. HIT.7421 activator is compliant with Low VOC 2.1 requirements.
The High Teck 7421-4 2.1 VOC 2K HB Primer Activator is a high-build two-component activator designed for professional collision repair applications. This activator works with compatible 2K primer systems to create a durable foundation for topcoat applications across multiple substrate types.
Mixed at a 4:1 ratio, this zero VOC activator provides excellent adhesion to bare metal, e-coat, plastic, and existing primer surfaces. The high-build formulation delivers superior coverage and filling properties, making it ideal for smoothing surface imperfections and preparing substrates for final finish work. The versatile substrate compatibility reduces inventory requirements while maintaining consistent performance across different repair scenarios.
Follow proper spray booth ventilation protocols and wear appropriate respiratory protection when applying. Ensure proper surface preparation and mixing ratios for optimal curing and adhesion performance.
Why Pros Choose High Teck Products HIT
- Medium dry, improves shop productivity
- Compliant with 2.1 VOC requirements.
Application Guide
- Clean and prepare substrate surface. Ensure bare metal, e-coat, plastic, or primer surfaces are free of contaminants.
- Mix primer and activator at 4:1 ratio by volume. Mix thoroughly to ensure complete activation.
- Apply mixed primer to prepared substrate using appropriate spray equipment.
- Allow proper flash time between coats and before topcoat application according to shop temperature and humidity conditions.
Compatibility
Compatible paint systems: 2K.
Specifications
| Part No. | 7421-4 |
|---|---|
| Product Line | HIT |
| Manufacturer | High Teck Products |
| UPC | 813834015252 |
| Rubberized | No |
- Mix Ratio
- 4:1
- VOC Content
- Zero VOC
- Compatible Substrates
- Bare metal, e-coat, plastic, primer
About High Teck Products
High Teck Products 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 surfaces can I use this primer activator on?
This activator is compatible with bare metal, e-coat, plastic, and existing primer substrates, making it suitable for most collision repair applications.
What's the mix ratio for this activator?
Mix at a 4:1 ratio with the corresponding 2K primer. Follow the manufacturer's mixing instructions for proper activation and performance.
Does this activator contain VOCs?
No, this activator is formulated as zero VOC, helping shops meet environmental compliance requirements while maintaining performance standards.
Documents & Safety
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.
Cure & dry schedule
Timing at 77°F
Pot life
Two hours
Flash
10-15 minutes
Sandable
1 hour @ 70 degrees F
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
Most in-stock orders for High Teck Products HIT 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 High Teck 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 High Teck Products HIT is 7421-4. Use this number when cross-referencing against TDS, SDS, or legacy supplier catalogs.
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