Finish 1
Finish 1 FH612-4 Medium Universal Hardener 1 qt Can
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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 job.
Finish 1™ offers a selection of reducers, hardeners, and cleaner solvents for primers, sealers and gun cleaners. Finish 1™ hardeners are available in fast, medium and slow temperature ranges for use in Finish 1™ ultimate spot/panel clear coat, overall clear coat, sealers, and 3.5 VOC acrylic enamel factory packaged…
Sherwin‑Williams Finish 1 FH612‑4 Medium Universal Hardener is a 1‑qt liquid hardener designed for use with Finish 1 basecoat systems in professional collision repair. It provides a reliable cure for e‑coat substrates and is typically applied as the second coat in a two‑coat system.
Key performance data include a pot life of 1 hour at 75 °F, a flash time of 15 minutes at 120 °F, and a recoat window of 10–15 minutes for the basecoat. The hardener delivers 627 sq ft per gallon at a 1 mil dry film thickness, and its low VOC rating of 2.2 g/L helps meet emissions regulations. Compatible with e‑coat substrates, it supports rapid production cycles while maintaining finish quality.
Safety: The product carries a “Warning” signal word with multiple GHS hazards (acute toxicity, flammable, carcinogen, etc.). Use eye protection, chemical‑resistant gloves, and a respirator in a well‑ventilated area. Flash point is 135 °F (PMCC). Follow H‑statement H612 and SDS guidelines for first‑aid and handling.
Why Pros Choose Finish 1 Medium
- For use in 3.5 VOC finish 1 factory packaged single stage colors and other finish 1 products
Application Guide
- Mix the Finish 1 Medium Universal Hardener with the corresponding basecoat at the manufacturer‑specified ratio (refer to basecoat instructions). The mixed material has a pot life of 1 hour at 75 °F.
- Apply the first coat using the recommended spray technique. Allow the coat to dry for 15 minutes at 120 °F before proceeding.
- Recoat with the second coat within the 10–15 minute recoat window after the first coat has dried.
- After the second coat, maintain the same drying conditions (15 minutes at 120 °F) before any subsequent handling or topcoat application.
Compatibility
Compatible paint systems: Enamel, Acrylic, Solvent.
Specifications
| Part No. | FH612-4 |
|---|---|
| Product Line | FNH |
| MFR Model | FH61214 |
| Standard/Approvals | GHS and OSHA Hazards | VOC Compliant |
| Manufacturer | Finish 1 |
| Trade Mark | Finish 1™ |
| UPC | 764423162041 |
| Brand | Sherwin-Williams® |
| Maximum Sale Quantity | 24 |
| Maximum Sale Day | 7 |
| Rubberized | No |
| Container Size (qt) | 1 |
| Container Type | Can |
| Form | Liquid |
| Type | Medium |
| Mixing Ratio | 1:4 |
- Dry Time
- 15 min @ 120 °F
- Recoat Time
- 10–15 min (basecoat)
- Pot Life
- 1 hr @ 75 °F
- Coverage
- 627 ft²/gal @ 1 mil dry
- VOC
- 2.2 g/L
- Compatible Substrates
- E‑coat
- Number of Coats
- 2 About Finish 1
- Safety Data Sheet (SDS)
- sherwinwilliams_fh61118_specification_sheet.pdf
- fh612_msds-en__us_en__us.pdf
- 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.
Finish 1 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 Finish 1 FH612‑4 be applied to?
It is compatible with e‑coat coated panels.
How long does it take to dry before recoating?
Dry time is 15 minutes at 120 °F; a basecoat can be recoated after 10–15 minutes.
What personal protective equipment is required when using this hardener?
Wear eye protection, chemical‑resistant gloves, and a respirator as recommended by the SDS.
Can I sand or apply a topcoat over the cured hardener?
Yes. After the 15‑minute dry time and once fully cured, the surface can be sanded and a topcoat applied.
What is the coverage rate for FH612‑4?
It covers approximately 627 sq ft per gallon at a 1 mil dry film thickness (about 0.25 qt per 156 sq ft).
Documents & Safety
Warning: This medium hardener is flammable and can cause serious eye injury, skin irritation, and respiratory irritation if inhaled. It is classified as a carcinogen and poses organ, reproductive, and oxidative hazards. Use safety glasses or goggles, chemical‑resistant gloves, and a suitable respirator when handling. Avoid breathing vapors, skin contact, and eye exposure. Always refer to the full SDS before use.
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