FROSIO inspection explained

A coating is only as good as its application. The best anti-corrosive primer, the most advanced antifouling, the toughest tank lining — none of them perform as intended if the steel was poorly prepared, the film was applied too thin, or the paint was overcoated before it had cured. On paper the system is perfect; on the hull it can still fail. Independent inspection is how an owner knows the job was actually done right.

What FROSIO is

FROSIO is a recognised Norwegian certification scheme for coating and surface-treatment inspectors. It sets a common standard of knowledge and competence, and inspectors are trained and examined against it before they can be certified. Because the scheme is well established and internationally respected, FROSIO certification is widely required on marine and industrial projects — from shipyards and offshore structures to bridges, tanks and heavy steelwork.

In practice, a FROSIO inspector is an independent, qualified pair of eyes. They understand coatings, corrosion, application methods and the standards that govern them, and they document what they observe. That independence is the whole point: the inspector answers to the specification, not to the schedule or the applicator.

What an inspector checks

Inspection runs alongside the work, not after it. An inspector monitors each stage while it can still be corrected, and records the results. The key checks include:

• Surface preparation — cleanliness of the blasted steel and the surface profile (roughness) that gives the coating its mechanical grip.
• Ambient conditions — air temperature and humidity, dew point, and steel temperature, so paint is never applied when condensation could form on the surface.
• Film thickness — wet film thickness during application and dry film thickness (DFT) afterwards, checked against the specification.
• Curing and recoat intervals — confirming each layer has cured and that the next coat goes on within the correct window.
• Adhesion — verifying the coating is bonded properly to the substrate and between coats.
• Coating continuity — checking for pinholes and holidays (tiny gaps) that would let corrosion start.

Why it protects your investment

Catching a problem during application is far cheaper than paying for a premature failure. A missed low-thickness area or a contaminated surface may cost minutes to correct on the day. The same defect left in place can mean rust breakthrough, blistering and a full repaint years early — often in a dry dock or shutdown that is expensive to arrange and costly to occupy.

There is a second benefit. A documented inspection record shows the system was applied to specification, which supports warranty claims and gives realistic, defensible expectations for the asset's service life. When something is inspected and recorded, everyone — owner, yard and coating supplier — is working from the same evidence.

When it matters most

Inspection adds the most value where access is hard-won and failure is expensive. Newbuilding is the obvious case: get the coating right once, in controlled conditions, and the asset starts life properly protected. Dry docking is another, because opening a vessel up is costly and every hour counts. And it matters wherever the consequences of failure are severe — ballast and cargo tanks, structural steel, and confined areas that are difficult and dangerous to reach for repair later.

Where Marisell fits

As a main Hempel dealer, we do not just supply coatings — we help make sure they are applied as intended. Our consultants hold international FROSIO certification and inspect the Hempel systems we supply, from surface preparation through to the final coat. You can see the full scope of our services, explore the marine applications we support, or contact us to discuss inspection on your next project. A well-specified system and an independent inspection are the surest way to turn a good coating on paper into lasting protection on the steel.