An exceptionally easy to-sand primer, that can be polished to a smooth, porosity-free surface. Uses: for surfacing patterns for composite molds, and where an easy sanding, high build primer is required.. Apply over tooling board, MDF, brick, concrete, plaster and clay. Features: Builds rapidly and provides a surface that sands quickly. • Use less sandpaper • Reduce sanding labor Easy to spray from HVLP guns. Low porosity, fine smooth surface. • Start sanding with a fine grit, reduce dust and film loss. • Build up to 30 mils.