100% Solids Epoxy Pre-Primer is formulated for use on both steel and masonry. For rusted steel where extensive surface preparation is needed, but not logistically possible, the penetrating properties and extended dry time - 16 hours at 25 °C (77 °F) – of this two-component epoxy seal crevices and other imperfections, promoting better adhesion for subsequent coats. For prepared masonry surfaces, V155 penetrates and seals, providing an excellent foundation for subsequent coats of Corotech epoxy floor coatings. The unique, 100% solids formula of V155 forms a sealed epoxy barrier that inhibits future corrosion.