Thermal spray metallizing cost (zinc, aluminum or zinc-aluminum alloy) depends on eight factors: area, access, surface preparation grade, sprayed metal, thickness, sealer, where the work is done (shop or field) and containment. Preparation and access often weigh more than the metal itself. With photos, dimensions and the specification, Induscoat replies within 24 business hours.
This guide is for buyers, maintenance managers and project managers considering metallizing for a steel structure, a bridge, a tank or process parts in Quebec and Ontario. It gives no dollar figures. It explains what pushes the cost up or down, so you can prepare a complete request and compare quotes on the same basis.
Why can't metallizing be priced per square foot without a site visit?
Because two surfaces with the same area can require very different work. A new beam in a shop and the same beam corroded, under a bridge deck, above a river, share nothing but their area. Spraying time is only one part of the job.
Metallizing cost is split between abrasive blasting, spraying, sealer or topcoat, access, containment, abrasive handling and inspection. The metal wire or powder matters, but it varies less than the rest. Our article on coating total cost of ownership explains why a system that costs more up front can cost less over its service life, which is often the whole case for metallizing.
The right question is not "how much per square foot?" but "what on this structure takes time, equipment and inspection?". The eight factors below answer it.
Which structure-related factors change the price?
The real area and the access set the base amount of work, before the metal is even chosen.
1. The area to metallize and its geometry
Area is measured as developed surface: flanges, webs, stiffeners, gussets and hidden faces all count. A large continuous surface (tank shell, box girder) sprays at a good rate. Trusses, angles, bolted connections and joints require edge work and more time per unit of area. A small batch carries almost all of the mobilization and equipment setup costs.
2. Access to the surfaces
Access sometimes weighs more than spraying. Working from the ground, from a lift, from scaffolding, from a suspended platform under a bridge or inside a confined space does not take the same setup time or the same safety measures. The spray gun must stay at a steady distance and angle: awkward access slows the rate and raises the risk of rework.
Why does surface preparation weigh so much on cost?
Because metallizing tolerates no compromise on cleanliness and profile. The bond of sprayed metal is mechanical: it depends on very clean steel and a sufficient angular profile.
3. The required preparation grade
The joint application standard SSPC-CS 23.00 / AWS C2.23M / NACE No. 12 and the ISO 2063 series require high-grade abrasive blasting, most often white metal (SSPC-SP 5) or near-white (SSPC-SP 10 / NACE No. 2, see our NACE No. 2 / SSPC-SP 10 preparation guide), depending on the service and the specification. That grade costs more in time and abrasive than preparation for ordinary paint. It also requires clean angular abrasive, a measured surface profile (ASTM D4417) and a short delay between blasting and spraying, which means crews must be synchronized. Abrasive blasting is therefore almost always the first line of the quote.
4. The starting condition
New steel with mill scale, pitted rusty steel and previously painted steel do not take the same effort. Deep pitting, soluble salts and thick old coatings lengthen preparation. Lead paint changes the nature of the job entirely and calls for regulated containment and disposal.
Do the metal, the thickness and the sealer change the price?
Yes, but less than preparation and access. The metal is chosen for the service first and for cost second, and the sealer is a cost item of its own.
5. The sprayed metal and the process
Zinc, aluminum and zinc-aluminum alloys do not behave the same in service or spray at the same rate. Thermal spray aluminum is often chosen for immersion, marine exposure or hot service; zinc is common in atmospheric and freshwater exposure. The process (electric arc or flame) changes productivity and the equipment on site. Our comparison of zinc vs aluminum thermal spray covers these criteria.
6. The specified thickness
Target thickness sets the number of crossing passes and the amount of metal. It is set in the owner's specification according to service life and corrosivity category. A higher thickness adds spraying time and extra measurements.
7. The sealer and the topcoat system
Sprayed metal is porous: a sealer penetrates those pores and slows the consumption of the metal, especially in immersion or aggressive exposure. A sealer alone adds one pass and a drying delay. A duplex system (sprayed metal, sealer, then paint coats) adds more passes, recoat delays and checks, but it can extend service life and provide a finish colour. The choice is made with our protective coatings service, the reference point for all our work.
Shop or field: where does metallizing cost less?
In the shop, as a rule, because access, climate and abrasive recovery are under control. Field work remains unavoidable for structures in place.
8. Work location and containment
In the shop, parts can be handled, abrasive is recycled and ambient conditions are stable. In the field, add equipment transport, compressed air and power supply, protection from rain, cold and humidity, and sometimes a heated and dehumidified enclosure. Containment of abrasive and dust is required near watercourses, in operating plants or on old lead coatings; it adds tarps, ventilation, dust collection and waste handling. Our article on blasting in operating plants and dust control describes these measures. For bridges and similar structures, see our bridge painting service.
Which factor weighs most by type of project?
The ranking changes with the context. The table below sums up what usually dominates.
| Type of project | Dominant factors | Key information to provide |
|---|---|---|
| New parts in the shop | Geometry, thickness, sealer | Drawings, parts list, specification |
| Bridge or outdoor structure in place | Access, containment, preparation | Photos, drawings, environmental constraints |
| Tank or equipment in immersion | Preparation, metal, sealer | Stored product, temperature, specification |
| Operating plant | Containment, phasing, access | Work window, site rules |
| Refurbishing an old structure | Starting condition, preparation, disposal | Coating history, lead tests |
How do you compare two metallizing quotes?
Compare them line by line before comparing totals. Gaps almost always come from a different scope:
- Preparation grade: SSPC-SP 5 or SSPC-SP 10, abrasive and target profile must be written down.
- Metal and process: zinc, aluminum or alloy, arc or flame.
- Thickness: minimum target value and measurement method (SSPC-PA 2).
- Sealer and topcoat: included or not, number of coats.
- Inspection: tensile adhesion (ASTM D4541), bend test on a coupon as provided by SSPC-CS 23.00, final report. Our coating inspection service can cover these hold points.
- Access, containment and waste: priced or left as allowances.
A lower quote that leaves out the sealer or the adhesion test is not cheaper: it delivers a different system.
Frequently asked questions
Can you give a metallizing price per square foot over the phone?
Not reliably. The price depends on preparation, access, metal, thickness and containment, which cannot be seen over the phone. With photos, dimensions and the specification, an accurate quote arrives within 24 business hours.
Does metallizing cost more than paint?
At application, it often costs more, mostly because of the required preparation. Over the service life, the comparison can flip when repainting cycles are expensive or hard to access. It is an analysis to run structure by structure.
Can metallizing replace hot-dip galvanizing?
It can for parts too large for a bath, structures already in place or field repairs. Our article on cold galvanizing vs hot-dip compares zinc-based protection options.
Do you metallize in winter?
Yes, inside an enclosure, when steel temperature, relative humidity and dew point meet the application standard and the specification. Heating and dehumidification are then part of the price.
Our crews and qualified subcontractors work from LaSalle, Montreal, across Quebec and Ontario, including Montreal and the North Shore. For a thermal spray metallizing project, the price is always on consultation: send photos, dimensions and the specification through the request a quote form and get a reply within 24 business hours.
Hicham M, P Eng, PMP
Engineer and project manager (PMP) at Induscoat. Over 16 years of experience in industrial coatings, composite repairs and wear protection on mining, energy and petrochemical sites in Canada and internationally.