Roller marks — those streaky lines or ridges left behind on a freshly painted wall — are one of the most common frustrations for DIY painters. The good news is they're almost always preventable with the right preparation, the right tools, and a bit of technique. Here's how to get a smooth, even finish every time.
Choose the Right Roller and Cover
Not all rollers are created equal. The nap (pile) thickness of your roller cover is the most important factor:
- Smooth or low-sheen walls: Use a short nap (6–10 mm) microfibre or woven roller cover.
- Textured or rough surfaces: Use a medium nap (12–15 mm) cover.
- Heavily textured surfaces (e.g. roughcast): Use a thick nap (18–20 mm) cover.
Cheap foam rollers can leave bubbles and streaks — invest in a quality roller frame and cover from a paint specialist or hardware store. Brands like Resene and Dulux sell rollers specifically matched to their paints, which is worth considering.
Prepare Your Paint Properly
Stir your paint thoroughly before use — pigments settle at the bottom and uneven mixing leads to patchy colour and sheen. If the paint has been sitting for a while, a paint stirrer attachment on a drill works well.
Avoid painting straight from a cold can. Paint that's too cold becomes thick and drags on the wall. Let it sit at room temperature (around 18–25°C) for at least an hour before use. Equally, avoid painting in very hot conditions — paint that dries too fast won't level out properly.
For most interior walls, a water-based (acrylic) paint is the standard choice in NZ. Quality matters: premium paints from Resene, Dulux, or Wattyl have better levelling agents and hide imperfections more easily than budget options.
Prepare the Surface
Roller marks are often made worse by an uneven surface underneath. Before you paint:
- Fill any holes or cracks with a suitable filler and sand smooth once dry.
- Sand glossy surfaces lightly so the new paint can bond.
- Clean the walls — dust, grease, and grime all affect adhesion and finish.
- Apply a primer if you're painting over a dark colour, bare plasterboard, or a porous surface. GIB recommends sealing new plasterboard with a purpose-made sealer before topcoating.
Master the Rolling Technique
This is where most DIYers go wrong. Follow these steps:
Load the roller correctly
Pour paint into a roller tray and roll the cover back and forth in the shallow end until it's evenly loaded — not dripping, but well saturated. A dry or overloaded roller both cause marks.
Use a 'W' or 'M' pattern
Apply paint to the wall in a large W or M shape (roughly 60–90 cm wide), then fill in the gaps with parallel strokes without lifting the roller. This distributes paint evenly before it starts to dry.
Keep a wet edge
Work in sections and always roll back into the wet paint you've just applied. If you let an edge dry before overlapping it, you'll get a visible ridge — the classic roller mark.
Finish with light, upward strokes
Once a section is covered, do a final light pass from bottom to top with minimal pressure. This helps the paint level out and reduces stippling.
Don't overwork the paint
Once paint starts to get tacky, leave it alone. Going back over semi-dry paint drags it and creates marks. Apply a second coat once the first is fully dry (check the manufacturer's recoat time — usually 2–4 hours for water-based paints).
Cut In Before You Roll
Always cut in (brush the edges, corners, and around trim) before rolling the main wall area. Use a quality angled brush and feather the edges out slightly so the roller can blend into them. Cut in one wall at a time rather than the whole room, so the brushed edges are still wet when you roll over them — this prevents a visible line between the brushed and rolled areas.
Lighting and Final Checks
Use a raking light (a torch or lamp held at a low angle to the wall) to spot any roller marks or missed patches while the paint is still wet. It's much easier to fix them now than after the paint has dried.
When to Call a Professional
If you're dealing with high stud ceilings, extensive surface damage, or heritage plaster walls, it's worth getting a professional painter in. A qualified tradesperson will have the right equipment (including extension poles, spray gear, and commercial-grade rollers) and the experience to deliver a flawless finish efficiently. You can find local, vetted painters on tradedirectory.co.nz.
Note: Painting is generally not restricted work under NZ law, so homeowners can do it themselves. However, if your home was built before the 1980s, be aware that old paint may contain lead. Sanding or disturbing lead paint creates a health hazard — check with WorkSafe NZ for safe handling guidance, and also be aware that homes of that era may contain asbestos-containing materials, so check with WorkSafe NZ before disturbing any surfaces.
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