Promac Rubber Duck Super Cold RBE (Rubberized Bitumen Emulsion) is a high-performance, water-based (Wb) waterproofing coating. In South Africa, the “Rubber Duck” range is a household name for leak prevention, and the Super Cold RBE is the heavy-duty choice for protecting foundations, retaining walls, and roofs.
The “Group” designation typically refers to its classification in the Promac waterproofing system, often sold in 5L or 20L quantities.
1. Key Features
- Rubberized Bitumen: Unlike standard bitumen, this is infused with rubber latex, which gives it superior elasticity. This allows the coating to stretch and contract with the surface during temperature changes (especially important in the high-heat/cold-night cycles of the Gauteng Highveld).
- Water-Based (Wb): It is safer to use and easier to clean up (brushes can be cleaned with water while the product is still wet). It also lacks the harsh, flammable fumes of solvent-based bitumen.
- Vapor Barrier: It acts as an excellent “damp-proofing” layer, preventing moisture from migrating through concrete or masonry.
- Adhesion: It bonds exceptionally well to concrete, cement plaster, and even old bitumen membranes.
2. Common Applications
- Foundations & Retaining Walls: Used to “tank” walls below ground level to prevent rising damp.
- Flat Roofs: Ideal for sealing large concrete roof slabs.
- Flashings & Gutters: Used in conjunction with a waterproofing membrane (geofabric) to seal joints and corners.
- Fish Ponds & Planter Boxes: Once fully cured (and usually over-coated), it is safe for non-potable water containment.
3. Application Guide (The 3-Step Process)
To ensure the “Super Cold RBE” doesn’t fail, it must be applied correctly:
- Priming: Mix the product 50/50 with water to create a primer coat. Apply this to the clean, dry surface and let it soak in.
- Base Coat & Membrane: Apply a thick layer of neat RBE. While wet, embed a waterproofing membrane into the coating, ensuring there are no creases or air bubbles.
- Top Coats: Apply two more neat coats of RBE over the membrane, allowing each coat to dry (turn from brown to black) before applying the next.
