Spray painting service

Before painting can begin, the metal workpiece must be thoroughly cleaned and prepared. An abrasive cleaning technique such as shot blasting is commonly used to remove oil, dirt, rust and old paint from the substrate to prepare it for finishing.

Once the part is free of contaminants, the liquid paint is then applied using a spray, pump or pressurised vessel. The paint is sprayed evenly across the surface of the part until it reaches the desired thickness (usually around 15-20 micrometres).

A fast and cost-effective process, spray painting is an ideal solution for low production runs where powder coating would be too expensive. It’s also a suitable finishing option for heat-sensitive parts as the paint can be left to air dry at room temperature rather than being cured in an oven.

The thinner coating also means parts often require multiple applications to reach the desired thickness and achieve an even finish.

What’s more, the spray painting process itself is less efficient than powder coating, with just 30-35% of the sprayed paint adhering to the treated part. Powder coating, on the other hand, has a transfer efficiency rate of around 60-70%.

If you’re unsure whether spray painting is the best treatment option for your metal project, please get in touch. Our team will be happy to advise you and, if appropriate, suggest alternative options to help you achieve the best possible finish.

Here are just some of the reasons to choose Knees Engineering for your metal finishing requirements: