SHERWIN WILLIAMS Finish 1 Ultimate Overall Clearcoat FC720 1 GAL with FH611 Fast Hardener — High-Solids, Fast-Cure

SHERWIN WILLIAMS Finish 1 Ultimate Overall Clearcoat (FC720) with FH611 Fast Hardener is a high-solids urethane clearcoat system formulated for fast, durable, high-gloss overall repairs and blending.

This two-component clearcoat package pairs FC720 Finish 1 clearcoat with the FH611 Fast Hardener to deliver excellent gloss, depth of image (DOI), and leveling for overall spray jobs or spot repairs. Designed for both air-dry and force-dry environments, it balances shop productivity with refinishing quality so you can achieve consistent results whether blending into adjacent panels or laying down a full clear. The system mixes at a 4:1 ratio and is engineered for smooth flow, easy buffing, and strong crosslinking when used per manufacturer directions.

How does this clearcoat perform in a busy collision repair shop?

Finish 1 Ultimate Overall Clearcoat with the FH611 Fast Hardener cures quickly to support fast turnaround times while keeping high-gloss control. It is suitable for both overall jobs and strategic blends, helping technicians maintain production schedules without sacrificing finish quality.

• High-solids formulation for fewer coats and improved coverage
• Fast hardener option reduces dry time in force-dry cycles
• Good flow and leveling minimize orange peel and reduce sanding
• Excellent buffing properties for rapid final finish

What mixing and application details should I follow for reliable results?

Mix the clearcoat and hardener at the specified 4:1 ratio by volume. Use appropriate reducers and follow spray equipment guidelines, flash times, and bake schedules recommended by SHERWIN WILLIAMS to ensure proper film development and adhesion.

• Mix ratio: 4 parts FC720 clearcoat to 1 part FH611 hardener
• Use recommended reducers for temperature and application method
• Apply in multiple even coats, allowing proper flash between coats
• Force-dry or air-dry per shop conditions and oven schedules

How does this system blend and buff compared with other clears?

This urethane clearcoat is formulated for smooth blending into adjacent panels and provides a high DOI that polishes to an even gloss. Its leveling characteristics reduce the need for heavy finishing work, and its buffing response delivers a showroom-quality sheen when properly cured.

• Excellent blending for feathered edges and panel transitions
• High DOI for deep, reflective finishes after polishing
• Balanced hardness for ease of sanding and safe buffing
• Consistent film build supports uniform final appearance

What safety and compatibility points should I consider before use?

As a two-component urethane product, use appropriate personal protective equipment, adequate ventilation, and follow SHERWIN WILLIAMS safety data sheet instructions. Ensure substrate preparation, primer, and basecoat systems are compatible with a urethane clearcoat to avoid adhesion or appearance issues.

• Wear respirator, gloves, and eye protection during mixing and spraying
• Follow manufacturer flash and cure guidelines to prevent solvent entrapment
• Check compatibility with primers and basecoats used in the repair
• Dispose of mixed material per local hazardous-waste regulations

Who is this for: SHERWIN WILLIAMS Finish 1 Ultimate Overall Clearcoat FC720 with FH611 Fast Hardener is aimed at professional collision-repair shops, body technicians, and refinishing specialists who need a high-solids urethane clear that blends well, cures quickly, and polishes to a high-gloss finish. It is ideal for shops performing both overall repaints and spot blending where consistent DOI, leveling, and buffing characteristics are required.