What does a specifier check before approving a coating system?
Answer
They check the whole system rather than a single product: surface preparation, primer, intermediate and topcoat, with dry film thickness for each and a corrosion category the system is rated for. A single-product page cannot be specified, because coatings are approved as systems.
A corrosion engineer is writing a protective coating specification that has to survive a consultant's review and twenty years of service.
Information to make clear
Use the fields that affect this buying decision. Leave unsupported claims out.
- Product type and binder chemistry
- Epoxy, polyurethane, alkyd and zinc-rich differ in everything that matters.
- System build-up
- Primer, intermediate and topcoat with dry film thickness for each.
- Corrosion category and durability
- The classification a specification will reference.
- Surface preparation required
- Determines whether the applicator can achieve it on site.
- Volume solids and theoretical spreading rate
- How the buyer costs the job.
- Overcoating window and pot life
- Application planning depends on it.
- Colour system and finish
- Standard fan decks and gloss levels.
Documents to prepare
State what can be published, shared on request or issued with an order.
| Document | What it supports | Suggested handling |
|---|---|---|
| Technical Data SheetMay be requested at: specification stage | System build-up, film thickness, spreading rate and application limits | Publish |
| Safety Data SheetMay be requested at: before site use | Hazard, handling and ventilation requirements | Publish |
| Corrosion test reportMay be requested at: specification and approval | Salt spray, cyclic or immersion performance under a named standard | Publish |
| Certificate of AnalysisMay be requested at: each delivery | Batch conformance for the delivered material | Issue per shipment |
| Volatile organic compound declarationMay be requested at: regulatory review | Compliance with the destination market's limits | Publish |
| Approved applicator or warranty termsMay be requested at: before specification is locked | What is covered, for how long, and under what application conditions | Publish |
| Reference project listMay be requested at: risk assessment | That the system has performed in comparable exposure | Publish |
Details to ask in an enquiry
Collect only the information needed to assess the request and respond.
- Substrate and its current condition
- New steel and maintenance repaint are different systems.
- Exposure environment
- Determines the corrosion category required.
- Required durability
- Drives the number of coats and the chemistry.
- Area to be coated
- The basis of both quantity and price.
- Application method and site conditions
- Spray, brush and roller change the product choice.
- Project location and timing
- Freight, shelf life and weather windows.
Related questions
Should we publish a full system specification for each environment?
Yes. A specifier's job is to select a system for an exposure, so a page organised by exposure environment rather than by product does their work for them. It also reduces the misapplication that damages your reputation when a single product is used alone.
How should warranty be presented?
State what is covered, the conditions that must be met, and who must apply it. Coating warranties nearly always depend on surface preparation and applicator approval, and a warranty presented without those conditions will be read as either misleading or worthless.
Are colour cards worth putting online?
Yes for the standard ranges, with the colour standard named. Screen colour is never accurate and everyone knows it, but the range and the reference system tell a buyer whether their required colour is a stock item or a special.
This is an editorial checklist, not a compliance standard. Requirements vary by market, customer and contract. Confirm current requirements with the responsible technical and commercial teams.
Plact Research. Plact's editorial desk for buyer-evidence guides. The guides organize common buyer questions, documents and enquiry fields. Requirements should be checked against current standards, regulations and contracts.