How does on-site paint spraying compare in cost to replacement?

Recoating architectural metalwork on-site typically costs a small fraction of the price of like-for-like replacement, in most cases between 10% and 25% of the replacement cost. Replacement requires removing existing metalwork, disposing of it, procuring new units, and installation, all of which involve significant material, labour, and disruption costs. Recoating restores the appearance and protective function of the existing metalwork for a fraction of that outlay, with minimal disruption to building operations.

On-Site Spraying & Commercial Recoating

Mobile Paint Spraying: On-Site Recoating for Commercial Metalwork

Q: What metalwork can be sprayed on-site?

A comprehensive mobile spray service can recoat any architectural or structural metalwork from aluminium to galvanised steel. Items particularly suited to on-site spraying include shopfront frameworks, curtain walling, aluminium window systems, roller shutter doors, lift doors, iron railings, entrance canopies, cladding panels, steel doors, office furniture, ventilation grids, sculptures, and decorative ironwork. The key criterion is that the item is installed, fixed in place and not easily removable, making in-situ recoating the most practical and cost effective option.

Q: What preparation is required before on-site spraying?

Thorough surface preparation is the most critical stage of any recoating project. The existing surface must be cleaned to remove all contamination including dirt, grease, mould, and loose or flaking paint. Any rust on ferrous metalwork must be removed back to sound metal. Dents or damage are filled and the surface abraded to provide mechanical adhesion for the new coating system. All surrounding areas, glass, and non-spray surfaces are masked and protected before spraying begins. The quality of preparation directly determines the adhesion, appearance, and longevity of the finished coat.

How a professional mobile spray team operates on commercial premises, the metalwork types suited to in-situ recoating, the preparation and application process, and why on-site spraying delivers a superior finish at a fraction of the cost of replacement.

Anthony Jones, Vanda Coatings Updated February 2026 8 min read On-Site Spraying Commercial Recoating Metalwork

Mobile paint spraying team applying coating to commercial shop front metalwork by Vanda Coatings

The vast majority of architectural metalwork on commercial buildings can be recoated to as-new condition without being removed from the building. Shopfront frameworks, aluminium window systems, curtain walling, roller shutter doors, lift doors, iron railings, entrance canopies, these are the items that form the core workload of a professional mobile paint spraying service.

Most property owners assume that restoring metalwork to a high quality finish means dismantling it, shipping it to a workshop, and reinstalling it afterwards. That is not the case. The work comes to the building, not the other way round.

What mobile paint spraying means in practice

A mobile spray team turns up with everything needed to do the complete job on site. That means spray units (HVLP or airless, matched to the coating and surface type), compressors, access equipment, masking materials, cleaning products, and the full coating system: primer, undercoat, and topcoat where applicable.

The team works as a self-contained unit. Nothing gets removed from the building unless it genuinely cannot be repaired in situ. Work is planned around the occupants' schedule. Evening or weekend working is standard practice, so preparation and spraying happen without disrupting the business during normal hours. Recoated surfaces are dry and ready for normal use the following working day.

For facilities managers and building owners, that is the real selling point. A professional recoat transforms the appearance and extends the life of the metalwork, with minimal disruption and at a fraction of the replacement price.

What metalwork is suited to mobile on-site spraying

A comprehensive mobile spray service operates across the full range of architectural and structural metalwork found in commercial premises. The most common categories are:

Shopfront frameworks, aluminium and steel extrusions forming retail unit frontages, including transom and mullion systems, door frames, and threshold sections
Aluminium window systems, casement, tilt-and-turn, fixed light, and curtain walling profiles on office, retail, and residential blocks
Curtain walling, large-scale glazed facade systems with profiled aluminium structure
Roller shutter doors, both punched and solid profiles in steel or aluminium, including box housing and bottom rail
Steel and fire doors, single and double leaf doors in commercial, industrial, and institutional settings
Lift doors and associated metalwork, lift car doors, landing doors, and surround panels
Iron railings and balustrades, decorative and structural ironwork on staircases, balconies, and perimeter boundaries
Entrance canopies, steel or aluminium canopy structures above main entrances
Cladding panels, horizontal and vertical steel or aluminium cladding systems on commercial and industrial buildings
Office furniture and interior metalwork, chairs, filing systems, shelving, partitioning, and ventilation grids
Sculptures and decorative ironwork, ornate or architectural feature metalwork, including the filigree ironwork found in period conservatories and civic buildings

The key criterion for on-site suitability is that the item is fixed in place. If it is bolted, welded, or otherwise installed as part of the building fabric, mobile spraying is almost certainly the most practical and cost effective recoating option.

10–25%

of replacement cost, typical price of recoating versus new metalwork installation

29 yrs

Vanda Coatings experience recoating commercial architectural metalwork across the UK

24 hrs

typical cure time before recoated surfaces are ready for normal use

Nationwide

mobile spray team coverage across mainland Britain from our Cardiff base

The case for recoating rather than replacing

The structural integrity of most commercial architectural metalwork outlasts the life of its coating. Aluminium extrusions, galvanised steel frameworks, and powder-coated steel doors are engineered to last decades, the paint system applied to them may deteriorate significantly within 10–15 years of outdoor exposure. Fading, chalking, flaking, and corrosion of the paint surface do not mean the underlying metal has failed.

When metalwork looks tired but is structurally sound, the rational response is to restore the coating, not to replace the substrate. Mobile spraying does exactly that, at a fraction of the cost and with none of the lead time, disposal costs, or installation disruption associated with replacement.

Beyond cost, there is a sustainability argument. Retaining and recoating existing metalwork avoids the embodied carbon of manufacturing and transporting new units. A professional recoat with a quality 2K acrylic coating system extends the service life of the substrate by a further 10–15 years, deferring or eliminating the need for replacement entirely.

Recoating versus replacement: a direct comparison

Factor	On-site recoating	Full replacement
Relative cost	10–25% of replacement cost	Full material, labour, and disposal cost
Disruption to building operations	Minimal, out-of-hours working, ready next day	Significant, removal, installation, snagging
Lead time	Days to weeks, project mobilisation only	Weeks to months, procurement, manufacture, delivery
Finish quality	As-new appearance, spray-applied 2K acrylic	New, but only as good as the replacement specification
Structural retention	Existing fabric retained, no loss of structural integrity	New unit installed, existing structure removed
Embodied carbon	Very low, retains existing material	High, new manufacture, transport, and disposal
Service life extension	10–15 years from a quality recoat	Dependent on replacement specification
Suitability	Structurally sound metalwork with degraded coating	Structurally compromised or beyond economic repair

The mobile spray process: from survey to handover

Every mobile spray project follows the same sequence. Each stage matters, and frankly, the outcome of the finished coat depends as much on what happens before the spray gun is picked up as on the application itself.

Site survey and specification

The project begins with a site survey, a thorough assessment of the metalwork to be recoated, the current condition of the coating system, any corrosion or damage that requires repair, access requirements, and any constraints around occupied areas, public access, or working hours. The survey informs the coating specification, the primer system, topcoat, application method, and any repair work required before spraying can proceed. A written quotation is provided covering all scope items.

Surface cleaning

The existing surface must be clean before any other preparation or coating work begins. Dirt, atmospheric contamination, grease, bird droppings, mould, and road grime are removed using appropriate cleaning agents and pressure washing or hand washing as required. On metalwork in marine or industrial environments, salt contamination and chemical deposits require specific cleaning treatment. The surface must be fully dry before proceeding, residual moisture under a new coating system is a primary cause of early coating failure.

Corrosion treatment and repairs

Any rust on ferrous metalwork is treated, loose and flaking material removed to bare metal by mechanical abrasion, and a corrosion inhibiting primer applied. Dents, deformations, and missing sections in the metalwork are filled and made good before the coating system is applied. On aluminium surfaces, any corrosion product or delaminated powder coating is removed back to sound substrate. The quality of this repair stage directly determines the final appearance and the durability of the new coating.

Abrasion and key preparation

The existing sound coating or bare metal substrate is abraded to create a mechanical key for the new coating system. The abrasion method, wet or dry, hand or machine, depends on the surface type and the extent of the preparation required. On aluminium, an etch primer is applied after abrasion to chemically bond the new coating to the substrate. On galvanised steel, a wash primer or suitable adhesion promoter is used. Correct preparation at this stage is what distinguishes a coating that lasts a decade from one that fails within a year.

Masking and containment

All surfaces not being sprayed, adjacent brickwork, glazing, floor surfaces, vehicles, signage, and any other sensitive areas, are masked and protected before spraying begins. Masking quality determines the cleanliness of the finished job and is critical on occupied commercial sites where overspray onto adjacent surfaces causes immediate problems. On larger projects, containment sheeting is used to prevent overspray dispersing beyond the immediate work area. The masking is applied methodically and checked before the spray gun is loaded.

Spray application

The coating system is applied by experienced operatives using professional spray equipment matched to the coating type and surface profile. Two or more coats are applied, with adequate flash-off time between each coat as specified by the manufacturer. Application technique, gun distance, angle, stroke overlap, and film build, is monitored throughout to ensure consistent, defect-free coverage. Coat thickness is checked against the project specification using a wet film gauge during application.

Inspection and site clearance

On completion of the final coat, the sprayed surfaces are inspected against the agreed specification, checking for coverage, colour consistency, film thickness, and any finish defects. Masking is removed carefully to produce clean, sharp edges at tape lines. The site is cleared of all materials, equipment, and waste on completion. Any snagging items are addressed before handover. A completion report and product data sheets are provided for the client's maintenance records.

Minimising disruption on occupied commercial sites

Most of our work is on occupied buildings, not empty industrial units. People are working inside, customers are coming and going, and the business needs to keep running. That changes how you plan and deliver the job.

On occupied commercial sites, disruption management comes down to:

Out-of-hours scheduling, spraying carried out during evenings, weekends, or between shifts, so that recoated areas are dry and accessible before normal business hours resume
Phased working, on larger buildings, working section by section so no entire entrance or access route is unavailable simultaneously
Advance notification, communicating with building occupants and tenants about which areas will be worked on and during which hours
Temporary access measures, providing temporary protection or alternative access routes where spraying affects entrances or key circulation routes
Rapid-cure coatings, specifying products with appropriate cure times for the project conditions, so surfaces are safe to use as quickly as possible after spraying

At Vanda Coatings, out-of-hours and weekend working is standard practice for occupied commercial sites, not an add-on. We have operated this model since 1997. Our teams are experienced at working within the operational constraints of retail premises, office buildings, leisure facilities, and industrial sites, and at planning and sequencing work to avoid disruption to the organisations occupying the spaces we are working in.

What a professional coating system achieves

How well the recoated surface performs comes down to the coating system you specify. For commercial architectural metalwork, a two-component (2K) acrylic topcoat is the standard. It gives you the colour stability, chemical resistance, adhesion, and durability that exterior metalwork needs.

A properly prepared and applied 2K acrylic coating on aluminium or steel delivers:

Long-term colour fastness, resistance to UV fading that produces a consistent colour across the life of the coating
Gloss retention, maintaining the specified sheen level over the coating's service life
Adhesion to the substrate that resists impact, abrasion, and thermal cycling
Chemical resistance to atmospheric pollution, rain, road salt, and cleaning chemicals
Compatibility with the full BS and RAL colour range, any specified colour can be matched

The coating system is selected at the specification stage based on the substrate type, the environment the metalwork is exposed to, and any particular performance requirements. Advice on coating selection is part of the site survey and specification service.

Frequently asked questions

Q What is mobile paint spraying?

Mobile paint spraying is the process of recoating architectural metalwork directly on the premises where it is installed, without dismantling or removing it from the building. A specialist team brings all necessary equipment to the site, carries out full surface preparation and coating application in situ, and clears the site on completion. It eliminates the disruption, cost, and lead time of workshop-based refurbishment, and is suitable for the vast majority of commercial architectural and structural metalwork.

Q What metalwork can be sprayed on-site?

A comprehensive mobile spray service covers the full range of commercial architectural metalwork, shopfronts, aluminium window systems, curtain walling, roller shutters, steel doors, lift doors, iron railings, entrance canopies, cladding panels, office furniture, ventilation metalwork, decorative ironwork, and sculptures. The defining criterion for on-site suitability is that the item is fixed in place. If it is installed as part of the building fabric and structurally sound, mobile spraying is almost certainly the most practical and cost effective way to restore its appearance.

Q How much disruption does on-site paint spraying cause?

Disruption is minimal when the project is properly planned. Mobile spray teams routinely work out of normal business hours, evenings or weekends, so that preparation and spraying are completed without affecting building operations during the working day. Modern coating systems cure rapidly, meaning recoated surfaces are dry to touch within hours and ready for normal use the following morning. The site is fully cleared of equipment and materials on completion of each working session.

Q How does the cost compare to replacement?

Recoating architectural metalwork on-site typically costs between 10% and 25% of the like-for-like replacement cost. Replacement involves removing existing metalwork, disposing of it responsibly, procuring and manufacturing new units, and reinstallation, all of which carry significant material, labour, and disruption costs. Recoating achieves an as-new appearance and extends the service life of the existing metalwork by 10–15 years, at a fraction of that total outlay.

Q What preparation is required before on-site spraying?

Surface preparation is the most critical stage of any recoating project. The existing surface must be cleaned to remove all contamination, any rust treated and removed, dents and damage filled, and the surface abraded to provide mechanical adhesion for the new coating. On aluminium, an etch primer is applied after abrasion to create a chemical bond between the substrate and the new coating. All surrounding areas are masked before spraying begins. The quality of preparation directly determines the adhesion, appearance, and longevity of the finished coat, cutting corners at this stage is the primary cause of premature coating failure.

Anthony Jones

Director, Vanda Coatings, 29 years experience

Anthony has been running mobile spray teams on commercial premises across the UK since 1997. From high-street shopfronts in city centres to curtain walling programmes on multi-storey office blocks, the principle is the same: bring the work to the building, minimise disruption, and leave behind a finish that will last. The ability to operate cleanly and efficiently on occupied commercial sites, often out of hours and within tight programme constraints, is the core competency that distinguishes a professional mobile spray contractor from a general painter and decorator with a spray gun.