RCM Prep & Paint 20 Litre is a premium-quality waterproofing solution, designed to provide long-lasting protection for a wide range of roofing and exterior surfaces. Whether you're working on new constructions or maintaining weathered surfaces, this system delivers superior durability, adhesion, and resistance to harsh environmental conditions. Recommended For: Cement and fibre cement roof sheets Cement roof tiles Chromadek and galvanised steel Zinc Alum and AluZinc Exterior trims like fascias, gutters, window sills, and cement garden pots Features & Benefits: Exceptional adhesion to a variety of surfaces Flexible, highly durable, and UV resistant Fungal and algae resistant when prepared correctly Easy to apply by an RCM Paint Brush or roller Suitable for coastal and inland environments Environmentally safe – water-based with no significant hazards Easy clean-up with warm, soapy water In addition, you can enhance your waterproofing system by adding the RCM Waterproofing Membrane for extra durability and the RCM Waterproofing Tape for sealing joints and edges. Ideal For: Galvanized metal roofs Chromadek sheeting Asbestos or Nutec sheets Cement tiles Parapets, overlaps, valleys, joints, ridges, and flashings Coverage: 30m² per 20kg (two-coat system) Coverage may vary depending on surface porosity (typically between 0.8–1kg/m²) Application Process: New Surfaces: Apply one coat of Anti Corrosion Metal Primer to the entire surface and allow to dry for 2–3 hours before overcoating. The area must be overcoated within 24 hours to prevent a loss in adhesion. Apply membrane with Leak Block (Bag A & B) as per membrane application on all parapets, overlaps, joints, valleys, and ridges. Apply the first coat of All Purpose Coating (Bag C & D) over the roof area at a spread rate of 7–8 m² per litre. Apply the second coat of All Purpose Coating (Bag C & D) as per the first coat application. Allow 3–4 hours drying time between coats. Weathered Surfaces: Apply one coat of Anti Corrosion Metal Primer to the entire surface and allow 2–3 hours drying time before overcoating. The area must be overcoated within 3 days to prevent a loss in adhesion. Apply membrane with Leak Block (Bag A & B) as per membrane application on all parapets, overlaps, joints, valleys, and ridges. Apply the first coat of All Purpose Coating (Bag C & D) over the roof area at a spread rate of 7–8 m² per litre. Apply the second coat of All Purpose Coating (Bag C & D) as per the first coat application. Allow 3–4 hours drying time between coats. Safety Information: Non-toxic and safe to use with proper ventilation. May cause allergic reaction in sensitive individuals—handle with care and read the label before use. Keep out of reach of children. Why Choose RCM Prep & Paint 20 Litre Proven results in coastal and inland conditions Backed by expert support and technical guidance Locally manufactured with the South African climate in mind Technical Data Sheet Colours What's in the box: 1 x RCM Prep & Paint Waterproofing System 20 Litre 1 x RCM Paint Brush 125mm 1 x RCM Leak Block 8kg 1 x RCM Membrane 100mm 1 x RCM All Purpose Coating 8 Litre NB: RCM Products are inside the bucket.