7 Best Practices Before Using a Paint Spray Machine

You can have the best paint spray machine on site, but if the walls aren’t prepared properly, the finish will always fall short. Poor preparation leads to uneven coverage, peeling paint, and costly rework. Whether you’re spraying a new build, refurbishment, or commercial space, taking the time to prep walls correctly is essential for achieving a professional result.

At CES Hire, we’ve spent over 40 years supporting painters and contractors with reliable equipment and expert advice. This guide breaks down the key steps on how to prep walls for painting before using a paint spray machine.

1. Assess the Wall Condition First

Before any preparation begins, take a close look at the surface you’ll be spraying.

Check for:

• Cracks, dents, or damaged plaster

• Damp patches or staining

• Flaking or peeling paint

• Uneven or glossy surfaces

Identifying issues early allows you to fix them properly before spraying, preventing defects from showing through the final coat.

2. Repair and Make Good

Any imperfections will be highlighted when using a paint spray machine, so repairs are non-negotiable.

Best practice includes:

• Filling cracks and holes with suitable filler

• Repairing damaged plaster or render

• Sanding repairs flush once dry

• Removing loose or flaking paint completely

Taking care at this stage ensures a smooth, uniform surface ready for spraying.

3. Clean the Surface Thoroughly

Clean walls are essential for good paint adhesion. Dust, grease, and residue can all affect how paint bonds to the surface.

Before spraying, you should:

• Brush or vacuum walls to remove dust

• Wash down greasy or contaminated areas

• Allow surfaces to dry fully

This step is especially important in kitchens, commercial units, and refurbishment projects where surfaces may be heavily soiled.

4. Sand for a Consistent Finish

Sanding helps create a consistent surface and improves paint adhesion.

Key sanding tips:

• Lightly sand previously painted walls

• De-gloss shiny surfaces

• Feather edges around repairs

Using the correct grit sandpaper will help avoid scratches while still providing enough key for the paint to bond effectively.

5. Protect the Surrounding Area

Paint spraying is fast and efficient, but overspray can travel further than expected.

Before you start spraying:

• Mask windows, doors, and fixtures

• Use painters tape on edges and trims

• Lay protective sheeting or floor coverings

Good protection saves time on clean-up and prevents damage to finished areas.

6. Prime Where Necessary

Priming is often overlooked, but it plays a crucial role in achieving an even finish.

You should apply a primer when:

• Painting bare plaster or drywall

• Covering repairs or patches

• Changing from dark to light colours

• Spraying over porous or uneven surfaces

A suitable primer helps regulate suction and ensures the topcoat sprays evenly.

7. Check Your Equipment Setup

Wall preparation goes hand-in-hand with correct equipment setup.

Before spraying, make sure:

• The paint spray machine is clean and well-maintained

• Filters and nozzles are suitable for the paint being used

• Paint is mixed and thinned according to manufacturer guidelines

Reliable equipment and proper setup reduce downtime and help deliver a consistent spray pattern.

Conclusion: Preparation Is the Key to Professional Results

Knowing how to prep walls for painting is just as important as choosing the right paint spray machine. By assessing surfaces, making proper repairs, cleaning thoroughly, and protecting the surrounding area, you set yourself up for a high-quality, professional finish every time.

At CES Hire, we don’t just supply paint spray machines, we help you get the best results from them. If you need advice on wall preparation, equipment hire, or accessories for your next spraying job, our experienced team is ready to help.

👉 Buy paint spraying equipment: https://ces-hire.com/product-category/plant-machinery/airless-paint-and-plaster-spray-machines/