High-quality powder coating and sealing start with surface preparation. Surface-level debris and imperfections can lead to subpar adhesion, resulting in spottiness or the possibility of coating failure down the line.

Sandblasting offers several advantages that other prep methods can’t equal, though it’s not always the right fit for every workpiece. Learn more about how different surface preparation methods work and when using sandblasting is the best option for your project.

Why Surface Preparation Matters

Surface coatings need to stick to the surface of a component to provide long-lasting protection and consistent coverage. But contaminants like rust, dirt, dust, or even older coatings can interfere. Chemical or abrasive surface preparation techniques can:

• Remove rust and scale buildup on old parts
• Abrade away older surface coatings
• Remove chemicals, dirt, or grease left over from production and shipping
• Finish newly produced goods by removing mold flash or providing a matte surface texture

Overview of Common Surface Preparation Methods

Methods used for surface preparation range from sandblasting to chemical stripping and shot blasting. Choosing the best one for your project can come down to the type of material, workpiece, and desired end result.

Sandblasting

Sandblasting is a popular abrasive technique used to prepare surfaces for powder coating. Sandblasting tools can disperse sand particles with substantial force, abrading a workpiece surface and chipping away at old buildup, rust, scale, and dirt. Professional operators can select from a wide range of abrasive media to prepare different workpieces and eliminate contaminants without damaging the products themselves.

Grinding

Grinding processes apply pads against surfaces, wearing away roughness or protrusions. While this can be a useful technique for finishing, polishing, or cleaning, as it can leave behind a smooth surface finish, it can’t help prepare three-dimensional goods or pieces with intricate detailing. When considering sandblasting vs. grinding, consider the manual effort required, whether grinding can reach all of the contamination, and if your workpieces can handle the strain.

Chemical Stripping

Chemical stripping techniques apply acid to workpieces, either by applying a layer of chemicals on the surface for a controlled period of time or by dipping workpieces into an acidic bath. Depending on the chemical strength and dwell time, chemical stripping can etch away grease, old surface layers, organic buildup, and more. However, this process can be dangerous and contribute to chemical pollution.

Shot Blasting

Shot blasters generate centrifugal force, blasting metal or concrete media against workpieces to abrade them and remove weak surface layers and buildup. Some units are fully enclosed, containing both the media and the workpiece, while others propel the media against oversized objects or surfaces.

Key Advantages of Using Sandblasting for Surface Preparation

Sandblasting is the preferred choice for a range of applications, offering the following:

• More efficient and controllable removal of contaminants and buildup
• Comprehensive removal of rust, which prevents renewed rust buildup
• Smoother surfaces that aren’t damaged by harsh shot blasting or chemicals
• Faster and more reliable removal of all surface contaminants

Further, the use of professional-quality equipment paired with the right sandblasting media makes the process very versatile. It’s important to consider the hardness of the surface material and select the media that achieves the required profile without compromising the integrity of the substrate.

Get Expert Insight and Services With Winning Colors

Winning Colors specializes in high-quality surface preparation and powder coating, and we’ve been providing our clients with reliable services since 2004. We’re committed to offering end-to-end powder coating options that start with thorough cleaning and surface preparation to ensure a long-lasting coating.

Contact us today to learn more about our process and to choose the right methods for your next project.