Industrial coating warranty: what to ask before you sign

Before you sign, ask who guarantees what (the manufacturer covers the product, the applicator covers the installation), which maintenance and operating conditions apply, which exclusions are listed and how a defect will be measured. A useful warranty refers to objective criteria, such as ASTM D610 for rust and ASTM D714 for blistering, and rests on inspection records kept during the work.

Buyers often compare quotes on the warranty period offered. That is rarely the right criterion: two warranties of the same length can cover very different things, and a warranty without application records is hard to enforce. This guide helps maintenance managers, buyers and project managers read a protective coatings warranty and build the file that makes it enforceable.

What is the difference between the manufacturer's and the applicator's warranty?

The manufacturer guarantees that its product matches its data sheet; the applicator guarantees that preparation and application meet the specification. A coating defect almost always falls under one or the other, and each tends to point at the other if responsibilities are not written down.

A joint warranty, signed by manufacturer and applicator, avoids finger-pointing. It usually requires inspection by the manufacturer or a third party at defined stages. Where it is not offered, the specification should at least state who answers for what.

What conditions come with a warranty?

Conditions cover preparation, ambient conditions, thickness, operation and maintenance: if any of them is not met or not documented, the warranty can fall away. Read them as a list of obligations, for the applicator and for the owner alike.

• Surface preparation. Grade achieved (for example SSPC-SP 10), profile, cleanliness with respect to salts and dust. See our NACE 2 / SSPC-SP 10 guide.
• Ambient conditions. Steel temperature, relative humidity, dew point, logged during each coat.
• Thickness. Measured to SSPC-PA 2, coat by coat; see the dry film thickness entry.
• Operation. Temperature, products in contact and cleaning cycles matching those declared at the outset.
• Owner maintenance. Periodic inspections and touch-up of mechanical damage within a reasonable time.

Our article on industrial painting specification contents shows how to put these conditions in the specification instead of discovering them in the warranty.

Which exclusions come up most often?

Common exclusions cover mechanical damage, operation outside the data sheet, substrate defects and appearance changes that do not affect protection. They are normal; the problem is vague exclusions, which allow almost any claim to be refused.

• Mechanical damage. Impact, abrasion, tools, handling.
• Operation outside limits. Temperature, chemicals or immersion that were not declared.
• Substrate. Concrete cracks, structural movement, corrosion already present under an old coating that was left in place.
• Appearance. Chalking, gloss loss or colour change, especially on epoxies exposed to UV.
• Inaccessible areas. Crevices, connections and edges not prepared for lack of access, if they were reported.

Also check how the warranty treats the owner's own actions. Changing the stored product, raising the operating temperature, using a new cleaning chemical or letting a third party repair damage can all void coverage if the warranty requires prior notice. A short clause stating that the warrantor will be told of such changes, and will answer in writing, avoids surprises years later.

Ask that each exclusion be specific and that excluded areas be identified on a drawing or list. Our article on coating failure modes helps tell an application defect from operating damage.

Why are inspection records the real proof?

Because in a claim, the file decides: without records of preparation, ambient conditions, thickness and tests, neither the applicator nor the owner can show that the warranty conditions were met. A warranty without a file is a promise that is hard to enforce.

A typical file includes:

• Daily reports. Areas treated, products and batch numbers, ambient conditions, crew.
• Preparation checks. Cleanliness grade, profile (ASTM D4417), dust (ISO 8502-3) and soluble salts if the specification requires it.
• Film checks. Thickness (SSPC-PA 2), adhesion (ASTM D4541 or D3359), holiday testing for immersion linings; see the holiday test entry.
• Non-conformances and rework. What was found, corrected and verified.
• Dated photos. Before, during and after, by area.

These tests are described in our article on coating inspection. An independent coating inspection service can keep this file on the owner's behalf.

How is a defect judged objectively with ASTM D610 and D714?

A defect is judged by rating it against a recognized standard named in the warranty: ASTM D610 for rust, ASTM D714 for blisters, and ISO 4628 for the full range of defects where needed. The warranty should state the rating at which rework is owed and the area over which it is assessed.

Three clarifications prevent disputes: the assessment area (whole structure, member or reference area), the threshold that triggers rework, and the excluded defects (mechanical damage in particular). The threshold is negotiated for each structure; there is no universal value.

What should you do when a defect appears?

Document before touching anything: photos, rating against the agreed standard, a record of operating conditions, then written notice to the warrantor within the contractual period. A repair made before the defect is recorded can void coverage.

• Joint inspection. It brings together owner, applicator and, where applicable, manufacturer.
• Root cause. Preparation, thickness, product, operation; an independent diagnosis helps if the parties disagree. See our strategic advisory service.
• Rework. It follows a written procedure and is documented like the original work.

Keep in mind that the warrantor's liability is often capped, for example at the value of the work or of the material. Read that limit alongside the remedy: a warranty that only replaces product, without covering access, containment or the cost of a new outage, may cover a small fraction of the real cost of a failure.

Also plan an end-of-warranty inspection: it lets you have defects fixed while coverage still applies.

Frequently asked questions

Is a longer warranty better?

Not necessarily. A shorter warranty with clear conditions, backed by a complete inspection file, often protects better than a long one full of vague exclusions.

Can the manufacturer guarantee the installation?

Some do, under a joint warranty with inspection at defined stages. Otherwise, installation is the applicator's responsibility.

Who should keep the inspection records?

The applicator keeps its quality control records; the owner can add independent inspection. Both files complement each other and should be handed over at the end of the work.

Does maintenance touch-up void the warranty?

It should not, if it follows a procedure accepted by the warrantor. Ask for that procedure to be written into the warranty.

How do you get a quote?

A good warranty starts with a clear specification and an inspection plan. Our protective coatings service sets these conditions with you before the work; our crews and qualified subcontractors work from LaSalle, including in Montreal and Abitibi-Témiscamingue. Send the specification, photos and the current condition of the structure through the request a quote form: pricing on consultation, reply within 24 business hours.