Primapore Post-Op Dressing - 8 X 4 - Box of 20. Primapore Post-Op Dressing - 11 3/4 X 4 - Box of 20. Detail. Primapore Post Operative Dressing is designed to dress post op wounds, minor cuts, abrasions, lacerations and puncture sites where a waterproof dressing is required. Primapore Post Op can also be used as a secondary dressing over gels, ointments and other primary wound dressings.