Best Exterior Paint for Coastal Homes in Mandurah
Updated: Sep 20
Homes in Mandurah, Halls Head, Falcon, Dawesville and other coastal areas are exposed to sunlight, rain, wind and airborne salt. These conditions can affect exterior coatings over time, but there is no single paint product that is automatically best for every coastal home.
The correct exterior coating system depends on the surface being painted, the condition of that surface, the existing coating and the preparation required.
This guide explains the main factors homeowners should consider when planning an exterior repaint in Mandurah.
For many coastal homes in Mandurah, the appropriate exterior paint will be either a premium exterior acrylic or a specialist masonry coating. The correct choice depends on the surface, existing coating, porosity, preparation requirements and the manufacturer’s specified system.
Is There a Special Paint for Coastal Homes?
Exterior coatings are selected according to the substrate and its condition rather than location alone.
A coastal home may contain several different exterior surfaces, including:
rendered or masonry walls
fibre-cement sheeting
timber
galvanised steel
previously painted metal
eaves and soffits
doors, windows and trims
These materials do not necessarily use the same primer or finishing product. A coating suitable for previously painted render may not be suitable for bare steel, timber or a roof. Some premium exterior acrylic paints are approved for use on several properly prepared surfaces. Specialist masonry coatings are designed for use as part of specified render, texture or masonry systems. The manufacturer’s current product information and technical data sheet should be checked before a coating system is selected.
What Should Be Considered Before Choosing Exterior Paint?
Before recommending a product, a painter should identify:
the material being painted
whether the surface is bare or previously coated
the type and condition of the existing coating
whether the existing coating is firmly adhered
whether the surface is chalky, dirty or contaminated
whether mould or corrosion is present
whether the surface is porous
whether there are cracks, failed sealants or damaged areas
whether moisture or another building defect is affecting the surface
the preparation, primer and number of coats required by the manufacturer
The colour and finish must also be suitable for the substrate. Some building-product manufacturers place restrictions on dark colours or specify a minimum Light Reflectance Value. These requirements should be checked before the colour is confirmed.
What Exterior Paint Options Are Available?
Australian manufacturers offer premium exterior acrylic paints as well as specialist coatings for render and masonry.
Common exterior product ranges include:
Dulux Weathershield
Dulux Acratex Acrashield Advance
Haymes Solashield
Wattyl Solagard
Wattyl Duraguard
Taubmans All Weather
This list is not exhaustive, and the products are not necessarily direct equivalents. Each range has its own approved substrates, preparation requirements, primers, finishes, application conditions and coverage information. The appropriate product must be selected using the manufacturer’s current specification for the surface being painted.
A well-known product name does not remove the need for correct surface preparation or make the product suitable for every substrate.
Weathershield or Acrashield Advance for Render?
Premium exterior acrylic paints and high-build elastomeric masonry coatings are different types of products. Dulux describes Acratex Acrashield Advance as a high-build elastomeric performance coating that forms a finishing barrier coat in Dulux Acratex texture and membrane systems.
It is intended for specified masonry and rendered-surface applications. It should not be treated as an interchangeable replacement for every general-purpose exterior paint.
A premium exterior acrylic such as Dulux Weathershield is designed for approved exterior surfaces when those surfaces are prepared and coated in accordance with the product instructions.
The appropriate choice depends on:
the substrate
the existing coating
the surface condition
the specified system
the required finish
the manufacturer’s application requirements
A rendered wall should therefore be inspected before deciding whether to use a general exterior acrylic, an elastomeric masonry coating or a more complete render and texture system.
Why Can the Cost of Exterior Coating Systems Vary?
Different products do not necessarily cover the same area per litre.
The cost of an exterior coating system can vary because of differences in:
product price
stated coverage rate
required film thickness
number of coats
primer or sealer requirements
surface texture
surface porosity
application method
surface condition
preparation and repair requirements
Manufacturer coverage figures are generally based on stated application conditions. Actual material use can vary according to the surface. A rough, textured or porous wall may require more material than a smooth, sealed surface of the same measured area. Deep texture also increases the true surface area being coated.
High-build products are applied to achieve a specified film build and may have a lower stated spreading rate than a conventional exterior acrylic. This means more litres may be required to coat the same measured wall area.
For this reason, comparing the price of one tin with another does not provide a complete comparison of the installed coating systems.
The product should not be spread more thinly than the manufacturer specifies simply to reduce material use.
Why Is Surface Preparation Important?
A coating must be applied to a surface that meets the manufacturer’s preparation requirements.
Depending on the substrate and its condition, preparation may include:
removing dirt and surface contamination
removing salt deposits
removing loose or flaking paint
treating mould where required
sanding appropriate surfaces
feathering sound paint edges
repairing suitable minor defects
removing and replacing failed sealant where included
treating corrosion
priming bare or repaired areas
allowing the surface to dry before painting
Preparation requirements vary between products and substrates. Bare timber, metal, fibre cement, masonry and previously painted render should not automatically receive the same preparation or primer.
If an existing coating has poor adhesion, applying another coating over it will not restore the bond between the failed coating and the underlying surface.
Can Paint Repair Cracks or Building Defects?
Paint is not a structural repair product. A coating may form part of a specified system for suitable rendered or masonry surfaces, but it does not repair structural movement, loose render, failed waterproofing or an active moisture problem. Before painting, further investigation may be required where there is visible evidence of:
significant or recurring cracking
loose, hollow or deteriorated render
active water entry
persistent dampness
rotting timber
extensive corrosion
failed building joints
drainage or waterproofing problems
If the cause of an underlying defect remains unresolved, cracking, staining, blistering or coating failure may return after repainting. A painter can report visible surface conditions. Structural, waterproofing or other building defects may need to be assessed and repaired by an appropriately qualified trade or building professional.
What Is Chalking?
Chalking is a powdery material that can form on the surface of an ageing coating.
A chalky surface must be assessed and prepared in accordance with the proposed coating system. Applying new paint over loose or inadequately prepared chalking can affect adhesion.
The preparation required will depend on the amount of chalking, the underlying surface and the manufacturer’s instructions for the selected primer and topcoat.
What Are the Signs That an Exterior May Need Repainting?
Homeowners may notice:
fading or uneven colour
chalking
peeling or flaking paint
bubbling or blistering
exposed substrate
cracking in the coating or surface beneath it
failed sealant around joints
rust or corrosion
recurring mould
deterioration around windows, doors and other edges
These signs do not all have the same cause. An inspection is required to determine whether the area needs cleaning, preparation and repainting or whether another repair is required first.
Does Exterior Colour Matter?
Colour selection can affect surface temperature.
Dark colours generally absorb more solar energy than lighter colours. For some timber, cladding and manufactured building products, the substrate manufacturer may restrict dark colours or specify a minimum Light Reflectance Value.
Before choosing an exterior colour, check:
the substrate manufacturer’s requirements
the coating manufacturer’s recommendations
any Light Reflectance Value requirement
the existing roof, paving and fixed finishes
how the colour appears in direct sunlight and shade
A colour should be tested on the home before the final selection is made. Colour can appear different according to light, surrounding materials, surface texture and the size of the painted area.
How Should Exterior Paintwork Be Maintained Near the Coast?
Exterior surfaces should be inspected periodically for dirt, salt deposits, mould, coating deterioration, failed sealants and exposed substrate.
Where cleaning is required, the cleaning method must be suitable for both the coating and the underlying surface.
Excessive water pressure, abrasive cleaning and incompatible cleaning chemicals can damage coatings, sealants or substrates. Manufacturer instructions should be followed before cleaning a painted exterior.
There is no single maintenance or repainting interval that applies to every home. The condition of an exterior coating is affected by factors including:
the substrate
preparation
coating selection
colour
application
exposure
maintenance
the condition of the building
Choosing an Exterior Coating System
The appropriate exterior coating system cannot be selected from the home’s location alone.
It should be based on:
an inspection of the surfaces
identification of the substrates
assessment of the existing coatings
the visible condition of the building
the manufacturer’s current product information
the preparation required
the required appearance and finish
Where product compatibility or substrate condition is uncertain, technical advice should be obtained from the coating manufacturer before work begins.
Exterior Painting in Mandurah and Peel
Hearth Painting provides exterior house painting throughout Mandurah and the Peel region.
We inspect the visible condition of the home, identify the different exterior surfaces and consider the existing coatings before preparing a written scope of work.
The proposed products and preparation are selected for the surfaces included in the quotation and applied in accordance with the relevant manufacturer’s current instructions.
Planning an exterior repaint in Mandurah or Peel? Contact Hearth Painting to arrange an on-site assessment and written quote.
