9-819 Underhood Additive

1 L additive formulated for the WaterBase 900+ series to improve through‑hardening, chemical resistance and overall durability for underhood and engine‑bay repairs. Mix into the basecoat and apply according to the WaterBase 900+ system instructions. Designed for use without a clear coat unless the system specifies otherwise; enhances performance in heat- and chemical-exposed areas. 1 L bottle packaging — size variant of 9-819 Underhood Additive.