Hawk & Trowel Plastering Centre stocks ProtectGuard Italian Plaster Sealer which offers the ultimate protection for all Venetian stucco and marmorino finishes. ProtectGuard Italian Plaster Sealer can be used inside and outside, and is the ideal product for waterproofing Italian, Venetian plaster. The very best product when you need the ultimate water and oil protection in kitchens, bathrooms and showers.