Custom Shop Urethane Slow Hardener - Quart

Custom Shop Urethane Slow Hardener - Quart is a premium-quality, professional-grade hardener formulated to deliver superior performance in automotive and industrial urethane paint systems. Engineered specifically for high-temperature or large-area applications, this slow-activating catalyst ensures optimal flow, leveling, and curing—making it ideal for full vehicle resprays, large panels, and projects requiring extended working time. Designed for use with Custom Shop’s urethane-based primers, clears, and topcoats, this hardener features an advanced isocyanate formula that delivers excellent cross-linking properties. The result is a tough, durable finish that resists UV degradation, chemicals, and harsh weather conditions. Whether you’re painting classic restorations, custom builds, or high-end refinishing work, this slow hardener offers the control and reliability needed to achieve flawless, show-quality results. The slow cure rate reduces the risk of solvent pop, mottling, and other application defects by allowing solvents to escape more gradually. This makes it an excellent choice in warm environments or when a smoother finish is essential. Its low-viscosity design ensures easy mixing and consistent sprayability, while maintaining color integrity and gloss retention throughout the curing process. Compatible with all Custom Shop 2K urethane products, this quart-sized hardener mixes at a standard 4:1 ratio (4 parts paint to 1 part hardener), providing ample coverage and extended pot life for more intricate or time-intensive paint jobs. Whether you're a seasoned professional or an advanced DIYer, Custom Shop Urethane Slow Hardener - Quart gives you the extended work time and professional-grade results you need for premium automotive finishes.

• Urethane Slow Hardener
• 1-Quart