How fireproof paint is applied correctly: technology and control

You can buy an excellent certified composition, calculate the thickness precisely — and still end up with a coating that will not work in a fire. The reason is almost always the same: the application technology was violated. Fireproof paint is more capricious than ordinary enamel: it is sensitive to the substrate, humidity and temperature and requires control at every stage. Let us look at how it is done properly.

Stage 1. Surface preparation

This is the foundation of the whole system, and you cannot cut corners here. The metal is cleaned of rust, scale, old paint, grease and dust. For critical structures the surface is prepared to the required degree of cleanliness — most often by abrasive blasting. Why it is critical: an intumescent composition holds exactly as well as it is bonded to the substrate. Poor cleaning — and on heating the char peels off together with the rust, leaving no protection.

Stage 2. Priming

Fireproof paint does not work on its own but in a system with a primer. The primer provides adhesion to the metal and corrosion protection. The key point: the primer must be compatible with the specific fireproof composition — this is stated in its technical documentation. An incompatible primer can lead to peeling or to the paint «not working». That is why the coating system — primer, fire protection, topcoat — is selected as a set, not separately.

Stage 3. Applying the fireproof layer

The composition is applied by brush, roller or airless spray — depending on the volume and geometry. The key rule is layering: the calculated thickness is built up in several passes with intermediate drying, not in one thick layer. A too-thick «wet» layer will crack, run or fail to dry inside. Application must be in permissible conditions: the manufacturer specifies the temperature range and the maximum air humidity. You cannot paint cold, damp or condensation-covered metal. TERM compositions are selected for the facility conditions — see the fireproof paints page (TERM-001, TERM-007, TERM-009).

Stage 4. Thickness control

While the paint is wet, the wet-layer thickness is checked with a comb gauge; after drying, the dry-film thickness is measured with a magnetic gauge at several points on each element. It is the dry thickness that is compared with the design and the test report. Everything is recorded in the works log — that is what the inspector will later check at acceptance.

Stage 5. Topcoat

If the structure is used in conditions of high humidity, outdoors or in an aggressive environment, a compatible topcoat (decorative-protective layer) is applied over the fire protection. It protects the intumescent composition from moisture and mechanical impact, extends the service life of the system and allows the structure to be tinted to the desired colour.

Why professionals should do this

Fire protection is hidden work: once the facility is handed over, you can no longer see whether the composition was applied correctly. Only a fire will reveal a mistake — at the worst possible moment. That is why a trained crew, thickness control at every stage, the log and a compatible material system all matter.

STATERM not only supplies TERM fireproof compositions but also carries out the application according to technology: with surface preparation, selection of a compatible primer and topcoat, thickness control and preparation of the as-built documentation for acceptance.

Call: +998 90 918 81 88.