Do It Once, Do It Right. Waterproofing Contractors - Merrylands, NSW . Service: Repairs, Restoration, Servicing. Item: Joints, Roofs, Tanks. Service Option: Free Quotes. Concern: Leaks. Type: Commercial, Industrial, Residential. Place: Balconies, Bathrooms, Decks, Retaining Walls. Assurance: Certified, Guaranteed, Licensed, Standards Australia