FOX PURMAX® ULTRA is an aliphatic polyurea-based, two-component, manually applicable in a single coat, cold-applied liquid waterproofing coating. Thanks to its pure elastomeric hydrophobic modified polyurea resin and special inorganic filler content, it provides excellent resistance to UV, chemical, mechanical and thermal conditions.
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Product Description
FOX PURMAX® ULTRA is a polyurea-based, two-component, aliphatic, cold-applied, low-viscosity liquid waterproofing and protection material. It can be applied in a single coat using a squeegee or airless spray gun; it can also be applied by roller or brush in a minimum of two coats. Thanks to its pure elastomeric hydrophobic modified polyurea resin and special inorganic filler content, it offers excellent resistance to UV radiation, chemical, mechanical and thermal conditions. Its 100% solids content, crack bridging capacity and hydrophobic nature provide long-lasting waterproofing. It can be applied with the appropriate primer on many different surfaces such as concrete, asphalt, bitumen, steel, plywood and ceramic. After application is complete, the coating must be protected from direct water contact for at least 24 hours. If desired, it can be overcoated with FOX PURMAX® TOPCOAT.
Key Benefits
- Single-coat application reduces labour and application time.
- The crack bridging property ensures that cracks from the substrate do not compromise the integrity of the coating.
- Retains colour and mechanical properties for a long time on terraces and roofs exposed to UV radiation.
- Its non-flammable and flame-retardant structure offers a safe waterproofing option.
- Applicable to different surfaces such as concrete, steel, asphalt and wood, providing versatility across a wide range of projects.
- Suitable for light traffic; local repairs can be carried out easily.
Advantages
- Easy single-coat application (squeegee, airless spray)
- Excellent adhesion
- Excellent chemical resistance
- Excellent mechanical resistance
- Flexible and abrasion-resistant
- Crack bridging capability
- High bond strength
- Hydrophobic (water-repellent) properties
- Suitable for continuous water contact
- Excellent thermal resistance; the product never re-softens
- Non-flammable
- Does not propagate flame
- Can be applied over asphalt
- Flowable
- Liquid-tight
- Walkable (light traffic)
- Suitable for local repairs
- Can be overcoated with FOX PURMAX® TOPCOAT
Usage Areas
- On terraces exposed to UV and solar radiation
- On terraces, balconies and all wet areas
- On roofs and garden terraces
- In swimming pools and ornamental ponds
- In aircraft hangars
- In water supply lines and channels
- In underground water tanks
- In tunnels
- In collection tanks
- In prefabricated structures
- In steel structures
- On wide-span terraces
- In roof gutters
- In planter box waterproofing
- In positive-side waterproofing of foundations and retaining walls
Application Steps
- 1
Surface Preparation – Concrete
Oil, grease, fuel, paraffin residues, release agents, cement laitance, shavings, loose particles and cured membranes must be completely removed. Surface irregularities and corners/edges must be repaired with FOX MORTAR FC188 T repair mortar to form a fillet with a minimum radius of 4 cm. Surface cracks must be filled and repaired with FOX PURSEAL PS600 polyurethane mastic. The appropriate FOX EPOTHANE® or FOX PURMAX® PRIMER 1K series primer must be applied.
- 2
Surface Preparation – Asphalt
The asphalt surface must be cleaned with a water jet. For applications subject to vehicle traffic, the load-bearing capacity of the asphalt must be suitable for the loads in use. The surface must be shot-blasted to expose at least 60% of the aggregates, then the appropriate FOX EPOTHANE® series primer must be applied.
- 3
Surface Preparation – Bitumen
Loose parts must be removed and blisters opened and dried. Main cracks must be opened, repaired and taped over. The appropriate FOX EPOTHANE® and FOX PURMAX® PRIMER 1K series primer must then be applied.
- 4
Surface Preparation – Plywood/OSB
Ensure that the panels are correctly installed, clean all joints and tape them with appropriate tape, then apply the appropriate FOX EPOTHANE® series primer.
- 5
Surface Preparation – Iron/Steel
Shot-blast to SA 2.5 quality prior to primer application, then apply the appropriate FOX EPOTHANE® series primer.
- 6
Mixing
FOX PURMAX® ULTRA contains pigments and fillers. Mix thoroughly with an electric mixer at 300–400 rpm and an epoxy/polyurethane resin mixing paddle until a homogeneous colour is achieved and no product remains on the bottom or sides of the container. Avoid over-mixing to minimise air entrainment.
- 7
Priming
Surfaces to be coated must be pre-primed with the appropriate FOX EPOTHANE® series primer or FOX PURMAX® PRIMER 1K series. Ensure that the substrate temperature is a minimum of +10°C.
- 8
Coating Application
FOX PURMAX® ULTRA can be poured onto the surface and applied evenly in a single coat using a notched trowel or squeegee. Alternatively, it can be applied in a minimum of two coats by roller or brush. When applying by roller or brush, the waiting time between coats must not exceed 10–24 hours. If this period has been exceeded (more than 4 days) or if you are unsure about intercoat adhesion, a FOX PURMAX® PRIMER 1K primer coat must be applied.
- 9
Tool Cleaning
Tools and equipment used must be cleaned immediately after application with solvent or polyurethane thinner. Once FOX PURMAX® ULTRA has cured, it can only be removed from surfaces by mechanical means.
After application is complete, the coating must be protected from direct water contact for at least 24 hours. If water contact occurs, the coating will soften and blister, losing its properties; the coating must be completely removed and reapplied.
Surface temperature must be a minimum of +10°C and a maximum of +30°C. Application must not be carried out outside this range.
Ambient temperature must be a minimum of +10°C and a maximum of +30°C.
Material temperature must be a minimum of +10°C and a maximum of +30°C.
Relative humidity must be a maximum of 80%. Attention must be paid to dew point and condensation. Keeping the substrate temperature above +10°C prevents dew formation that could damage the coating.
Concrete surfaces to be coated with epoxy/polyurethane must be at least 3 weeks old prior to application; a vapour barrier layer must be created for slabs on grade.
Mixing must be carried out with an electric mixer at 300–400 rpm and an epoxy/polyurethane resin mixing paddle. Failure to use the correct mixing paddle will entrain air and cause air bubbles on the coating surface.
When applying by roller or brush, the waiting time between coats must not exceed 10–24 hours. If this period has been exceeded (e.g. more than 4 days), a FOX PURMAX® PRIMER 1K primer coat must be applied.
Materials to be used should be brought to the application site 1–2 days in advance and allowed to acclimatise to ambient conditions.
In cold weather, packaging should be kept at +20°C–25°C to improve the workability of the products.
Rain, dust, wind, animals and insects must be prevented from entering the building while the coating is still fresh.
The product must be stored away from direct sunlight, between +5°C and +30°C, in its original packaging, in a cool and dry environment, protected from frost. Shelf life is 6 months from the date of manufacture.
For short-term storage, pallets must not be stacked more than 3 high; for long-term storage, pallets must not be stacked on top of one another.
It is dangerous to approach storage and application areas with open flames; areas must be ventilated.
Work clothing, protective gloves, goggles and a mask must be worn during application. Contact with skin and eyes must be avoided; in case of contact, wash thoroughly with plenty of water and soap; if swallowed, seek medical attention immediately.
Food and beverages must not be brought into application areas. The product must be stored out of reach of children.
Consumption figures are given for ideal conditions assuming an ambient and surface temperature of 20°C. Consumption may increase on uneven surfaces and in cold weather conditions.
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