Painting louvre or slatted timber shutters without drips comes down to three things: thorough preparation, using the right amount of paint, and working in a logical order so wet paint never drips onto a surface you've already finished. With a bit of patience, you can get a smooth, professional result at home.
Why Louvres Are Tricky
The angled slats on louvre shutters create a series of overlapping surfaces that catch drips and runs easily. Paint applied too thickly on the top face of one slat will drip onto the slat below before it has a chance to dry. The key is thin, even coats and a disciplined painting sequence.
What You'll Need
- Fine-bristle angled brush (25–38 mm works well for most slats)
- Small foam roller (optional, for flat frame sections)
- Drop sheet or old newspaper
- Sandpaper (120–180 grit for prep, 220 grit between coats)
- Sugar soap or mild detergent
- Painter's tape
- Quality exterior or interior paint suited to timber (see below)
- Timber primer if painting bare or stripped wood
Choosing the Right Paint
For exterior shutters, choose a quality exterior acrylic or oil-based enamel formulated for timber. Brands like Resene, Dulux, and Wattyl all offer exterior timber paint ranges suitable for NZ conditions, including our high UV environments and coastal humidity. For interior shutters, a water-based semi-gloss or gloss acrylic is easy to work with and cleans up quickly.
Always use a compatible primer on bare timber before your topcoats — this seals the wood and prevents uneven absorption that can cause blotchiness and runs.
Preparation: The Most Important Step
- Clean the shutters thoroughly with sugar soap or a mild detergent solution. Rinse and allow to dry completely — painting over damp timber is a common cause of adhesion failure.
- Sand existing painted surfaces lightly with 120–180 grit to give the new paint something to grip. If the old paint is flaking or peeling, strip it back to bare timber.
- Fill any cracks or holes with a flexible exterior filler (for outside shutters) or interior filler, then sand smooth once dry.
- Wipe down with a damp cloth to remove all dust, and let dry again before painting.
- If the shutters are still hung, tape off surrounding walls, frames, and hardware with painter's tape.
The Right Painting Order (No Drips!)
This is where most DIYers go wrong. Follow this sequence every time:
Step 1 – Remove or prop the shutters if possible
Taking shutters off their hinges and laying them flat (or propping them at a slight angle) gives you far more control. If you must paint them in place, tilt the louvres to a consistent angle.
Step 2 – Paint the slats first, working from top to bottom
- Open or tilt all slats to the same angle.
- Load your brush lightly — less paint than you think you need.
- Paint the underside of each slat first, working from top to bottom. This catches any drips before you paint the top face.
- Then paint the top face and edges of each slat, again top to bottom.
- Check for drips as you go and brush them out immediately.
Step 3 – Paint the frame last
Once all slats are done, paint the outer frame (stiles and rails). This way any brush marks or small drips from the slats won't land on a freshly painted frame.
Step 4 – Apply a second coat
Let the first coat dry fully according to the manufacturer's instructions (check the tin — drying times vary by product and NZ humidity). Lightly sand with 220 grit between coats, wipe clean, then repeat the same painting order.
Tips to Prevent Drips
| Tip | Why It Helps |
|---|---|
| Load the brush lightly | Less paint = fewer runs |
| Keep coats thin | Two thin coats beat one thick coat every time |
| Work in shade, not direct sun | Heat causes paint to skin over before it levels, trapping runs |
| Brush out drips immediately | Wet paint is easy to fix; dried drips need sanding |
| Use an angled brush | Reaches into tight slat gaps more easily |
| Paint on a calm, dry day | Wind and humidity affect drying and finish quality |
Spray Painting as an Alternative
If you have a lot of shutters to do, a paint sprayer can give an excellent finish on louvres with minimal brush marks. However, spraying requires careful masking of surrounding areas, good ventilation, and some practice to avoid runs from over-application. Check WorkSafe NZ guidance if using solvent-based products indoors, as fumes can be hazardous.
When to Call a Professional
For most homeowners, painting shutters is a manageable DIY job. However, consider hiring a qualified painter if:
- The shutters are lead-painted (common in homes built before 1980) — sanding or stripping lead paint is a health hazard and requires proper precautions. Check WorkSafe NZ for guidance.
- The shutters are rotting or structurally damaged — a painter or joiner should assess whether repair or replacement is needed first.
- You want a flawless spray finish and don't have spraying experience.
- The shutters are large, high up, or difficult to access safely.
You can find qualified local painters on tradedirectory.co.nz who can give you a quote and get the job done efficiently.
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