Preparing Walls For Painting 2

Preparing walls before you paint might not seem like the most exciting task at first, but it’s essential if you want a smooth finish that makes your paint last longer.

Beginner Intermediate Advanced
1 hour

Here’s why surface prep is worth it, every step of the way.

Why do I need to clean walls before painting?

Walls can be covered in dust and dirt unless they’re cleaned regularly. Although most modern paints are made to adhere to nearly any surface, they’ll stick best to smooth, clean surfaces. If the surface is dirty, oily or greasy, you risk paint peeling or bubbling when it’s dry. If walls are dusty when you apply paint, surfaces may look mottled or bumpy instead of smooth. 

Why do I need to fill cracks in walls before painting?

We all know painting over the cracks isn’t a good idea. Why? A fresh coat of paint accentuates any cracks or imperfections, making the wall look messy and unfinished. Watch out for cracks, tiny holes from nails and screws, or dents from door handles or furniture.

Why do I need to fill gaps around skirting boards before painting?

If there are large or small gaps around skirtings, cornices and walls, filling them means you’ll get a clean, crisp painted line between your wall and the wooden trim. Caulking/filling these gaps also gives you a smooth barrier, so gaps don’t get filled with dust, dirt or even insects. A flexible filler such as Selleys No More Gaps copes with building movement, so it won’t crack.

Why do I need to sand a wall before painting it?

Unless you’re painting a brand new wall, chances are it has bumps, imperfections and old roller lint from previous paint jobs. Sanding before you paint gets rid of any rough spots, leaving your paint surface smooth for a great-looking finish. Sanding also adds adhesion to walls; the sandpaper creates small, rough ridges that mean the paint sticks well to the wall, and is less likely to flake.

Why do I need to remove flaky paint before painting a wall?

Painting straight over flaky paint is a quick route to an uneven finish that peels or bubbles. Peeling paint can also mean there’s a lack of adhesion between the wall and paint. Painting over it simply masks the problem, instead of fixing it.

Weatherboard paint preparation

Much like interior walls, exterior weatherboard needs to be cleaned, sanded and have any gaps filled before re-painting. Maintaining weatherboards means getting rid of rough areas and old flaky paint. This will help new paint last much longer as it will have a clean surface to adhere to.

How do I prepare walls before painting?


No More Gaps Interior Multi-Purpose

Trust Selleys for all your interior gap filling needs. Our No More Gaps Interior Multipurpose gap filler delivers a smooth finish with superior flexibility and low shrinkage.

Spakfilla Rapid

When you need to make quick repairs, trust Selleys Spakfilla Rapid to get the job done. This fast-drying formula makes small repairs a breeze, and it's easy to sand.

Sugar Soap Concentrated

Selleys Original Sugar Soap Super Concentrate is a powerful cleaner for all surfaces. From walls to floors, get your home sparkling clean with our effective solution.

Super Cloth

Selleys Super Cloth is the perfect cleaning accessory for your home. Clean everything from countertops to tiled surfaces and more. Learn more now, including where to buy.

How to Guides

How To Prepare Your Walls for Painting

Get your walls ready for a fresh coat of paint with Selleys. Our guide will show you how to prepare your walls for painting and achieve a professional finish.

Black Mould Removal

Eliminate mould in your bathroom with Selleys. Our guide will show you how to clean and prevent mould from growing in your bathroom.

How To Use a Caulking Gun

Learn how to use a caulking gun for a professional finish with Selleys step-by-step guide. Get tips & tricks to make the most of your sealant.

Filling Cracks in Doors and Trims

Get your doors and trims looking new again with Selleys. Our guide will show you how to fill cracks and restore your home's appearance.