6 October 2026 · 3 min read · Heathurst Coatings
Most repaints need two finish coats over a sound, prepared surface, with a primer or sealer first wherever the surface needs one: bare timber, new plaster, patched areas, stains and glossy surfaces. A big colour change or a porous surface may need a third coat. One coat rarely gives even colour and full durability.
Why do you need two coats of paint?
Paint films are thin. A single coat often leaves uneven colour, thin patches over edges and repairs, and a film that doesn't wear as well. The second coat evens out colour and sheen and builds the thickness the paint was designed for. Paint manufacturers' specifications are usually written for two coats.
When do you need primer?
Use a primer or sealer on:
- Bare timber, to seal it and help the topcoat bond.
- New plasterboard or plaster, which is very absorbent.
- Patched and filled areas, so they don't show through as dull spots ("flashing").
- Stains from water, smoke or tannins, which can bleed through ordinary paint.
- Glossy or previously enamelled surfaces, after sanding, so the new paint adheres.
- Bare metal, with a primer suited to the metal.
How many coats of primer do you need?
Usually one. A second may be needed on very porous surfaces, raw timber that soaks up the first coat, or heavy stains that still show after the first. More primer is not better for its own sake. What matters is a sealed, even surface ready for the topcoats.
Can you skip primer?
Sometimes. If the existing paint is sound, clean and similar in type, and you are repainting in a similar colour, you can often go straight to two finish coats. Some products are designed to self-prime on certain surfaces. Check the product's instructions for your surface.
When do you need three coats?
- Going from a dark colour to a light one, or the reverse.
- Some strong reds, yellows and deep colours, which can need extra coats to reach full depth.
- Very porous or patchy surfaces.
- High-wear areas where extra film build adds durability.
Tinting the primer toward the final colour can sometimes save a coat on a big colour change.
Why do paint touch-ups show?
Touching up a small mark often leaves a patch that looks slightly different, even with the original paint. Common reasons:
- The original paint has faded or aged.
- The sheen differs because the patch was applied differently (brush versus roller).
- The repair wasn't primed, so it absorbs paint differently.
- The paint batch or tint is slightly different.
For the best result, prime any repair, use the same application method, and feather the edges. If the patch still shows, repaint the whole wall from corner to corner. That is often the only way to get an invisible result.
How long between coats?
Follow the recoat time on the tin. It depends on the product, temperature and humidity. Recoating too soon can cause drag marks and a soft film, and waiting far too long on some products can affect adhesion.
How Heathurst approaches coats and priming
We decide the system surface by surface: what needs priming or sealing, which Dulux product suits it, and how many coats it takes to get even colour and a durable finish. All of that is written into your quote, so you know exactly what you are getting. Learn more about our interior painting service, or read what goes into a quality paint job.
Get a quote
We paint homes and businesses across all of greater Melbourne, with the same standard on every job. Request a free on-site quote through our contact page, or call 0418 351 120.
