A great exterior finish starts long before the first coat of paint goes on. Proper preparation is what helps exterior paint last longer, look better and perform properly in Irish weather conditions.

Whether you’re refreshing a faded façade or painting newly repaired masonry, taking the time to prep your walls correctly can make all the difference.

Wall colour: Dingle Mist and Slate Grey

Why exterior preparation matters

Exterior walls are constantly exposed to rain, wind, UV rays, algae growth and fluctuating temperatures. Over time, surfaces can become dirty, chalky, cracked or unstable.

Painting directly over these issues can lead to:

• Peeling paint
• Poor adhesion
• Uneven colour
• Reduced durability
• Premature paint failure

Good preparation helps create a sound surface for your paint to bond to, giving you a longer-lasting finish and better overall protection.

Step 1: Wash down exterior walls

Before painting, exterior walls should always be cleaned thoroughly to remove:

• Dirt and dust
• Algae and mould
• Loose paint
• Pollution staining
• Salt deposits in coastal areas

Power Washing

A pressure washer is one of the quickest and most effective ways to clean masonry surfaces before painting.

Step 2: Treat algae and mould

Green staining, algae and mould are common on Irish exteriors, particularly in shaded or coastal areas.

Painting over untreated growth can allow it to return underneath the new coating.

What to do

• Remove visible growth during washing
• Apply a suitable fungicidal treatment if needed
• Allow surfaces to dry completely before painting

Step 3: Repair cracks and damaged areas

Once the wall is clean and dry, inspect the surface carefully.

Look out for:

• Hairline cracks
• Blown render
• Loose masonry
• Small holes or chips
• Areas of flaking paint

Small cracks and imperfections should be filled and repaired before painting.

Tips for repairs

• Remove all loose material first
• Use an exterior-grade filler or repair mortar
• Sand repairs smooth once cured
• Ensure surfaces are clean and dust-free before priming

Taking care of repairs now helps create a smoother final finish and prevents moisture from penetrating the surface later.

Step 4: Stabilise powdery or chalky surfaces

Older masonry surfaces can become dusty, porous or chalky over time. If paint is applied directly onto unstable surfaces, adhesion problems can occur.

This is where a stabilising solution becomes essential.

Fleetwood Quick Dry Masonry Stabiliser

designed to:

• Stabilise chalky or porous surfaces
• Improve adhesion
• Help create a sound base before painting
• Prepare weathered masonry for topcoats

It is ideal for:

• Older rendered homes
• Previously painted surfaces showing chalking
• Exterior walls with uneven absorbency

Allow the stabiliser to dry fully according to product instructions before applying your exterior paint.

Step 5: Check the weather conditions

One of the most overlooked parts of exterior painting is timing.

Even the best exterior paint performs poorly if applied in unsuitable conditions.

Best conditions for exterior painting

• Dry weather
• Mild temperatures
• No rain forecast
• Avoid direct blazing sunlight
• Avoid painting during very damp or windy conditions

Wall colour: Brookview

In Ireland, spring and summer are generally the best times for exterior projects, but checking local forecasts is always recommended before starting.

Exterior prep accessories

Having the right tools can make preparation quicker, easier and more effective.

Useful exterior prep accessories include:

• Pressure washers
• Scrapers and wire brushes
• Exterior filler knives
• Sandpaper and sanding blocks
• Masonry brushes and rollers
• Dust sheets and masking tape
• Extension poles for hard-to-reach areas

Good preparation tools help achieve a cleaner finish and improve efficiency throughout the project.

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Ready for painting

Once your walls are:
✔ Clean
✔ Dry
✔ Repaired
✔ Stabilised
✔ Properly prepared

…you’re ready to start painting.

Preparation may take time, but it’s one of the most important steps in achieving a durable, long-lasting exterior finish that stands up to Irish weather conditions.

Wall colour: Killiney Hill