? Spray Max 2K Aerosol Rapid Primer Filler ? A unique isocyanine-free primer formula that delivers excellent fill and build, quick dry times and easy sanding in a convenient 2K aerosol ? 2K iso-free primer in an easy to use aerosol with spray gun like results ? Activate, shake and spray ? Fast dry and easy sanding ? Good color holdout ? Color: Gray ? Mix: Ready to use, Activate, shake and spray ? Substrate: Properly prepared metal ? Suggested Use: Use for priming before applying color ? Top Coat: 1K / 2K base / topcoat system