Liquid rubber coating New Zealand: Ensuring reliable sealing and protection

Rubber or liquid rubber, is a polymer-modified bitumen-rubber emulsion . The bitumen-polymer mixture / liquid rubber coating has traditionally been presented on the market as a waterproof roof coating. Recently, the liquid rubber coating has been further developed and can now be used for excellent sealing on a variety of substrates.

Differences in coatings are mainly in the viscosity and the basis of the variant (natural base (latex) or artificial base (silicones).) However, this is not the only achievement of this coating: for example, its properties also ensure that machines and silos (metal) anti-corrosion properties, because liquid rubber has the following characteristics:

  • UV-resistantcan therefore be applied both inside and outside
  • Waterproofelastic, seamless application repels all liquids (and therefore also corrosion)
  • Chemically resistant ; light chemicals and salt solutions have no chance
  • Temperature resistantmaintains at temperatures from -40 degrees to 160 degrees
  • Environmentally friendlycontains no solvents, is water-based and has no harmful fumes when applied
  • Sustainableapplication guarantees a minimum of 15 years of protection of the subsoil

From road construction to roof coverage: these properties ensure that liquid rubber coating can be used for a wide range of applications. In this article we give you advice on all possibilities, the benefits and applications of liquid rubber products, as well as where to find them in New Zealand.

The 6 main applications of liquid rubber coating

Liquid rubber coating is a product that is widely used for private purposes. No wonder: it is a very reliable sealing or coating agent that can be applied even on damp surfaces . This also makes it an excellent solution for large or industrial projects.

Virtually, liquid rubber is one product that can be used on all kinds of substrates (steel, concrete, wood). Therefore it is imperative to weigh up your own goal of the project. In order to provide insight into this, we include the most important functions of this protective layer.

  1. Corrosion protection  (steel constructions, silos, walls, machines) 
    There are many ways to protect steel from corrosion , but the big advantage of liquid rubber is that it completely adheres to the substrate. This protects the steel from corrosion even if mechanical damage occurs. In addition, it is a coating over existing corrosion, which camouflages and neutralises the rust.

  2. Sealing subsurface  (cellars, parking decks, flat roofs, storage pits, gutters, swimming pools, pond) 
    Rubber paint is ideal for filling leaks, holes or cracks where water may come in handy. It covers even at relatively large cracks; liquid rubber is particularly elastic and can stretch up to 800% of its original size. It can be applied to external constructions, such as a leak in a parking deck, but also in damp locations such as cellars. This makes it a strong example of a waterproof coating.
  3. Protection or coverings  (roofs, roads, housing, bridges, tunnels) 
    Liquid-tight properties make it a good under- or intermediate layer for water-permeable substances, such as concrete. It can also be used on flat roofs or as covering tunnels. In our article on roof coating you can read more about coating options on roofs. Damage and leaks for underlying structures are therefore a thing of the past.
  4. Construction of airtight construction (real estate, parking garages, factories, offices) 
    Small gaps or minute openings; while building a house for example, they often cause an uncontrolled air flow (draft). Liquid Rubber can prevent this because of its elasticity and is perfect as an under-layer to make a house completely insulated or airtight. With this, it creates a sustainable solution; contributing to the energy efficiency of a building.
  5. Prevention of rotting wood  (playground equipment, furniture, fences, garden houses) 
    The water-repellent properties of liquid rubber are also ideal for protecting wood against wood rot. This thick, opaque layer provides extra durability for outside wood structures.
  6. House, garden and kitchen repairs (shower channels, window frames, cellars, drain pipes, pond) 
    Thanks to its enormous elasticity, liquid rubber is perfect for small household chores. It is perfect to fill holes and cracks of pipes, shower channels and outside on the roof. In addition, you can also use it to protect your pond, for example, and make seams in your basement water-repellent.

Drawbacks of liquid rubber coating

Liquid rubber coating is not a suitable solution for every sealing project. For example, it is totally unsuitable for decorative purposes. If you are considering using liquid rubber, keep this in mind:

  • Black or gray is standard;  white, brown or transparent liquid rubber is only applied by a specialist
  • Spotless surface is required; a grease-, dirt- and oil-free surface is a requirement for application
  • Poorly recyclable; raw materials are poorly degradable
  • Can not be directly applied over asphalt; an intermediate layer is required for application on roads
  • High consumption; you need about 1 – 2.7 liters per m2, which makes it relatively expensive for large surfaces

Are these disadvantages an obstacle to the project you have in mind, or do you have additional questions? Feel free to contact us without obligation! We can put together a suitable alternative with you. We also have an extensive network of coating specialists who can give you customized advice.

Applying rubber coatings in 3 steps

One of the great benefits of liquid rubber is the ease of application. There are only three basic steps to a liquid rubber application. Whether spray, brush, trowel, or roller, the coating will adhere to almost every surface – concrete, stone, bitumen, EPDM, wood, PVC, metals, foam, tile, and zinc.

Step 1: Preparing the surface

Poor surface preparation may result in failure of the coating system; adhesion is affected leading to preventing optimal performance.

A properly prepared substrate is paramount to the optimal application and performance of a coating. In the case of liquid rubber the substrate needs to be clean, dry, free from grease, dust, and other particles. Power washing the area is recommended. Cracks in the surface should be repaired beforehand for the best waterproofing result.

Applying white liquid Rubber coating NZ

A white rubber coating reflects UV rays, keeping the substrate cooler

Step 2: Applying the coating

Always study the manufacturer’s instructions on application and obey them.

Liquid rubber should not be applied in temperatures below 5°C, nor when rain is expected within 24 hours, so make sure to check the weather. The coating can be applied with a brush, trowel, roller, or spray, and is cold applied. The minimum layer thickness for a waterproof membrane is 2 mm. When painting, the average coverage is 1 L per m2, yielding a 1 mm thickness. The coating is not applied in one thick coat but rather built up through layering.

Step 3: Film curing

Stick with the given curing times; too early traffic on the coated area may result in coating failure and have a great financial impact.

Once the liquid rubber is applied, it needs to cure. Though it is touch dry in only a few hours, it will take 48 to 72 hours for the coating to be fully cured and bonded to the substrate. After this point usual traffic and usage may resume.

How to waterproof a flat roof

Because of the unique combination of versatility, flexibility, and high performance, there are many areas which can benefit from liquid rubber, including roofing, environmental protection barriers, concrete sealing (and protecting steel reinforcement), ponds, planters and basements.

The benefit of having a liquid rubber waterproofing coating installed is that there is limited down time, limited work hours, and so limited extra costs. The basic application process for waterproofing a flat roof might look as follows:

  1. Power wash the area to be coated and, once dry, clean the area of all debris and particulates.
  2. If there are cracks greater than 3 mm use a joint filler or mastic to fill them in.
  3. At an expected coverage of 1L to 1 m2, pour the desired amount of liquid rubber onto the roof, and spread across the area using a roller or brush. Once the roof is coated evenly, leave to dry.
  4. Once the first layer is touch dry, repeat the procedure for the second coat.
  5. Leave for 48 hours to cure fully.

Where to buy rubber paint NZ

Rubber coating is available from suppliers across New Zealand, for all projects great and small. There are contractors up and down the country who provide liquid rubber installation services for roofing, waterproofing, and any other project you may have. If you wish to buy rubber coating, or would like to be connected with one of our partners, get in touch! Our experts are here to assist, just make use of our free quote service to find the right coating solution for your needs.

Liquid Rubber Waterproof SealantBrush, rpll-on and sprayable high-performance coating that can be applied over many existing surfaces including concrete, wood, brick, metal… Which forms a durable, seamless, waterproofing membrane20L$485.30
Liquid Rubber Smooth CoatingHighly flexible, elastomeric membrane (aka a stretchy skin) that is designed to reflect heat, solar and UV rays, reduce thermal heat transmission as well as aid the waterproofing properties20L$485.30
Gripset Betta Bitumen RubberVersatile solvent free liquid membrane that can be used as a cost effective Bitumen Paint for general applications such as waterproofing underground walls, and surfaces, garden beds, landscaped areas, fish ponds, stock troughs and water features1L$22.98


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