U-POL MXM30 Standard Hardener for Maximum Clearcoat (Quart) $33.11 Brand U-POL Manufacturer Part Number MXM30 Speed Medium Volume 1qt. UPC 5010796112547 condition New U-POL MXM30 Standard Hardener for Maximum Clearcoat (Quart) Standard hardener for U-POL Maximum Clearcoat. Maximum Clearcoat uses European quality resins for excellent gloss retention.