Shot Blasting and Surface Preparation Services
Professional surface preparation for steel, aluminium and fabricated components, ensuring strong adhesion and long-lasting powder coating finishes across Harlow, Hertfordshire, Essex and London.
What Is Shot Blasting and Surface Preparation?
Shot blasting is a mechanical cleaning process that fires abrasive particles at high speed against metal to remove rust, mill scale, old coatings and contaminants. Surface preparation is the broader process of cleaning and treating metal so that a coating bonds properly and lasts. Over 80% of premature coating failures are caused by inadequate preparation — not the coating itself.
At Spraytech, preparation is included as standard on every powder coating job. We prepare:
- Structural steel
- Fabricated components
- Architectural metalwork
- Aluminium and mild steel parts
- Industrial equipment and assemblies
Our process ensures surfaces are clean, uniform and ready for coating.
Which Industries Need Shot Blasting Services?
We work with:
Steel fabricators
Structural sections, beams, brackets and fabricated assemblies blasted to Sa 2½ standard before powder coating for construction and infrastructure projects.
Construction contractors
On-programme surface preparation for balustrades, staircases, cladding frames and site metalwork, scheduled to match your build programme.
Manufacturing companies
Batch preparation of production components, enclosures, frames and assemblies with consistent surface quality across every item in the run.
Our preparation services are designed to support both one-off projects and high-volume work.
Why Surface Preparation is Critical
Proper surface preparation plays a key role in the performance of any coating system.
It helps to:
This is particularly important for components used in external or high-wear environments.
Why Choose Spraytech for Shot Blasting Services?
Consistent, High-Quality Results
Our blast process is controlled for abrasive type, pressure and exposure time, ensuring every surface meets the required cleanliness grade and profile depth.
Suitable for a Wide Range of Components
We prepare everything from small fabricated parts and domestic gates to large structural steel sections up to 10 metres in length.
Supports Long-Term Durability
Proper preparation ensures powder coatings last longer and perform better — 15–25 years outdoors instead of premature failure from poor adhesion.
Efficient Turnaround
Items move directly from our blast facility to our coating line, minimising the gap between preparation and coating. This prevents flash rust and keeps your project on schedule.
Our Shot Blasting and Preparation Process
Inspection and preparation of surfaces
We assess each item’s material type (mild steel, aluminium, cast iron, galvanised), the level of rust or contamination, and any existing coatings. This determines the correct abrasive media, blast pressure and pre-treatment chemicals.
Sanding and priming where required
Items are blasted in our enclosed blast room using steel grit, steel shot or aluminium oxide (for aluminium components). The abrasive strips the surface back to clean, bare metal with a controlled surface profile of 25–75 microns, typically to ISO 8501-1 Sa 2½ standard.
Spray application of finish
After blasting, loose dust and residual abrasive are removed using compressed air. The surface is inspected for any remaining contamination before chemical treatment.
Drying and curing
For mild steel, iron phosphate conversion coating is applied to create a corrosion-resistant base layer. For aluminium, a chromate-free conversion coating promotes adhesion and prevents oxidation beneath the powder coat. Galvanised steel receives a specific etch primer treatment.
Final inspection and quality checks
Surface cleanliness, profile depth and pre-treatment coverage are checked before the item moves to our powder coating line. Items are coated within 4 hours of blasting to prevent flash rust.
Our Shot Blasting and Preparation Process
Applications We Support
Our shot blasting and surface preparation services are used for:
Surface Preparation Services Across Hertfordshire, Essex, London and the South East
Based in Bishop’s Stortford, we provide shot blasting and preparation services across:
We are well positioned to work with powder coating projects throughout the UK
Request a Quote for Shot Blasting and Surface Preparation Services
Send us your drawings, specifications or production requirements and we’ll provide a fast, competitive quote.
Shot Blasting and Surface Preparation
Why is surface preparation important before powder coating?
Surface preparation is the single most important step in achieving a durable powder coating finish. Over 80% of premature coating failures are caused by inadequate preparation — not the coating itself. Blasting removes rust, mill scale and contaminants, and creates a roughened surface profile that the coating bonds to. Without it, coatings peel, blister and fail prematurely.
Do you offer preparation as part of your coating service?
Yes. Shot blasting and surface preparation are included as standard on every powder coating job where they are required. Items move directly from our blast facility to our coating line within 4 hours to prevent flash rust and ensure the strongest possible bond.
What materials can you prepare?
We prepare mild steel, aluminium, galvanised steel, cast iron and stainless steel. Each material receives a specific abrasive type and pre-treatment process. Aluminium is always blasted with non-ferrous media (aluminium oxide) to prevent iron contamination.
Can you handle large components?
Yes. Our blast rooms can accommodate items up to 10 metres in length, including structural steel beams, long railing sections and large fabricated assemblies. We also handle high-volume batch work for manufacturing and construction projects.
What standard do you blast to?
We typically blast to ISO 8501-1 Sa 2½ (near-white metal), which is the standard required by most powder coating specifications. This means the surface has no more than 5% residual staining after blasting. Higher cleanliness grades (Sa 3) can be achieved where specified.
Do you offer shot blasting as a standalone service?
Yes. We provide shot blasting as both a standalone preparation service and as part of our full powder coating process. If you need items blasted for someone else to coat, for restoration, or for cleaning without coating, we can do that. Contact us for a quote.
How much does shot blasting cost?
Costs depend on the size, quantity and condition of the items. As a guide: a pair of garden gates costs £30–£60 to blast, a set of four chairs £25–£50, and a single alloy wheel £15–£30. When combined with powder coating, preparation is usually included in the overall price.
