What is Powder Coating and Blasting? A Guide to Metal Restoration
If you are looking to restore old metalwork or protect new fabrications, you have likely come across the terms "blasting," "powder coating," or "blast and paint." But what exactly do these terms mean, and why are they often used together? At Blastcoat, based in Hyde Heath, we specialize in both processes. Here is a breakdown of how they work and why they are the industry standard for protecting metal across the UK. 1. What is Blasting? Blasting (often called abrasive blasting or sandblasting) is the essential first step in the metal finishing process. It involves forcibly propelling a stream of abrasive material against a surface under high pressure. Why is it necessary? Before you can coat any metal, it must be perfectly clean. Blasting serves two purposes: Cleaning: It strips away rust, old paint, mill scale, and contaminants that would cause a new coating to peel or fail. Profiling: It creates a microscopic texture (or "anchor profile") on the metal. This rough surface allows the new coating to grip tightly, ensuring it doesn't chip or flake off later. In our industry, you will often hear the term "Blast and Paint." This simply refers to the complete system: first blasting the metal to clean it, and then immediately painting or coating it to seal it before rust can return. 2. What is Powder Coating? Powder coating is a dry finishing process that has become popular for everything from industrial machinery to garden gates and car wheels. How does it work? Unlike traditional wet paint, which uses solvents, powder coating uses a free-flowing dry powder. Application: The powder is applied using a spray gun that gives the particles an electrostatic charge. This causes the powder to stick magnetically to the grounded metal part. Curing: The coated part is placed in a large oven and heated. The heat causes the powder to melt and flow into a continuous, uniform "skin." Result: As it cools, it forms a hard, durable finish that is much tougher than conventional paint. 3. Why Use Them Together? You might wonder, "Is powder coating the same as sandblasting?" The answer is no—they are two halves of the same solution. Think of it like building a house: Blasting is the foundation, and Powder Coating is the structure. If you powder coat over dirty or smooth metal (without blasting), the coating may look good initially but will quickly fail because it has nothing to hold onto. By combining professional abrasive blasting with high-quality powder coating, you create a barrier that is: Highly Resistant: Stops chipping, scratching, and fading. Corrosion Proof: Prevents rust from attacking the metal underneath. Eco-Friendly: Powder coating creates less waste and releases fewer chemicals than wet paint. Summary Whether you are restoring a vintage car chassis or finishing a batch of industrial brackets, the Blast and Paint method is the best way to ensure longevity. At Blastcoat, we handle the entire process from our facility at Weedon Hill Farm. Whether you are local to Amersham or sending parts from elsewhere in the UK, we ensure your metal is blasted clean and coated to last.