Custom Shop Ultra Flow Urethane Clearcoat with KH2021 Hardener, Gallon KitCustom Shop KH2021 Hardener is a professional grade urethane activator specifically engineered for use with Custom Shop KC2020 Ultra Flow Clear Coat. Designed to deliver consistent, high performance results, this hardener ensures proper curing, adhesion, and durability in automotive clear coat applications. Formulated for a precise 4: 1 mix ratio with KC2020 clearcoat, KH2021 provides reliable activation that helps produce a deep, high gloss, wet look
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