How to Clean Walls Before Painting
Painting over dirt and grease leads to adhesion problems. Learn how to clean walls properly.
Preparation is the foundation of every good decorating job. How to Clean Walls Before Painting is a skill that separates professional decorators from amateurs — and it is the stage where most DIY attempts go wrong.
Every experienced decorator knows that 70% of the work is preparation and 30% is painting. Skip the prep or rush it, and no amount of expensive paint will save the finish. Get the prep right, and even budget paint will look professional and last for years.
In this article, we cover the professional techniques, the right products and the common mistakes to avoid. Follow these steps and your finishes will be consistently excellent.
Key Tips
Always clean surfaces before painting — paint will not stick to dirt or grease
Use the right primer for the surface — there is no universal primer
Fill cracks generously, then sand flush — under-filling shows through paint
Allow fillers to dry fully before sanding — wet filler clogs sandpaper
Use stain-blocking primer over water marks, nicotine and grease
Dust off and tack cloth before painting — dust causes a rough finish
Frequently Asked Questions
Is this relevant to UK decorators specifically?
Yes. How to Clean Walls Before Painting is written for UK painters and decorators, with reference to UK products, regulations, pricing and practices. However, the core principles apply to decorators everywhere.
Do I need any special tools or software for this?
Most of what we cover can be done with basic tools and organisation. Trade Assist includes tools that make many of these tasks easier — quoting, CRM, scheduling, invoicing and expense tracking — but the principles work regardless of the tools you use.
How can I learn more about this topic?
This article covers the essentials, but the best way to learn is through practice. Try the techniques on your next job, see what works for you and refine your approach. Trade Assist also includes AI-powered trade advice if you have specific questions.
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