Poxoprime ll is for application over uncoated concrete or plaster. Used as an undercoat for Poxolon or Zeron, Poxoprime ll soaks in and seals the surface. Compatibility with wet surfaces helps reduce downtime by allowing the pool to be cleaned and primed in one day. Do not apply over any old coating. The coverage is approx. 200-250 sq. ft. per gallon.