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 Technical specifications for Sherwin-Williams® Finish 1™ FH612-4 Medium Universal Hardener, 1 qt Can, Liquid 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 2About Finish 1 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 Safety Data Sheet (SDS) sherwinwilliams_fh61118_specification_sheet.pdf fh612_msds-en__us_en__us.pdf 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. 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 [email protected].
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