Recommended for Thai projects
Thailand’s best-known paint maker. Industrial primers and finishes, Thai colour codes and touch-up paint available nationwide – simple for owners to maintain.
Paint systems & brands
Paint systems built for Thailand’s climate – with brands you know
Heat, humidity, monsoon rain and salt air attack steel. We specify every coating system to ISO 12944 for your site – and apply TOA or the brand your consultant prefers in our factory, under controlled conditions.
Why the paint system matters in Thailand
A steel building is only as durable as its coating. Average humidity above 70 %, six months of monsoon and coastal salt mean the wrong system rusts within a few years – while the right one protects the frame for 15 years or more before first maintenance.
We choose the system by corrosivity category (ISO 12944-2) and durability target (ISO 12944-5), then prove it with blast profile, film-thickness and adhesion records for every lot.
ISO 12944
Paint systems by site environment
| Environment | Category | System | Total DFT | Typical use |
|---|---|---|---|---|
| Dry interior | C2 | Alkyd or epoxy primer + finish | 80–120 µm | Air-conditioned factories, offices, retail interiors |
| Inland urban & industrial | C3 | Zinc-phosphate epoxy primer + epoxy MIO + polyurethane finish | 160–200 µm | Warehouses and factories in Bangkok, Ayutthaya, Isan, the North |
| Coastal & humid industrial | C4 | Zinc-rich epoxy + epoxy MIO + polyurethane finish | 240–280 µm | Chonburi, Rayong, Samut Sakhon, Songkhla, food plants, cold stores |
| Marine & aggressive chemical | C5 | Zinc-rich epoxy + high-build epoxy + polyurethane finish | 320 µm + | Map Ta Phut, ports, seafront resorts, fertiliser and chemical plants |
| Hot-dip galvanising | C4–C5 | Galvanised to ISO 1461, optional duplex paint | 85 µm zinc + | Purlins, external members, wet process areas |
Brands
Paint brands we apply
For Thai projects we recommend TOA first – the brand Thai owners, contractors and maintenance teams know, with touch-up paint and colour matching available everywhere in Thailand. International brands are applied whenever your specification names them.
Thai alternative
Thai manufacturer of decorative and protective coatings, familiar to Thai contractors for finishing and maintenance.
Industrial & decorative
Widely used in Thai industrial estates, especially by Japanese manufacturers.
Protective & fire protection
Specified by international consultants for C4–C5 systems and intumescent fire protection.
Protective & fire protection
Heavy-duty anti-corrosion and intumescent systems for industrial and marine environments.
Protective & fire protection
Protective coatings and intumescent systems often named in multinational specifications.
Brand names are trademarks of their owners. Final paint products and thicknesses are confirmed in each project’s paint specification.
R30 – R120
Intumescent fire protection, optimised
Fire rating is calculated member by member from section factor and required rating (R30–R120). Only members that need protection are coated, at the thickness each one needs – with a compatible primer and top coat from the same system so the warranty stays valid.
Fire-protection paintPaint quality control
Applied in our factory, checked on every member
Surface preparation
Shot blasting to Sa 2.5 (ISO 8501-1), profile measured before priming.
Controlled application
Airless spray in covered paint bays; temperature, humidity and dew point logged.
Film thickness
Wet and dry film thickness measured on every member, recorded per lot.
Adhesion & cure
Adhesion tests and cure checks before packing – no damaged coating leaves the factory.
Colour
Finish colours to TOA colour codes, RAL or your corporate standard.
Touch-up kit
Matching touch-up paint shipped with every delivery for bolts and transport scratches.
FAQ
Paint system questions
Can you use TOA paint on our steel?
Yes. TOA is our recommended brand for Thai projects. We apply TOA industrial primers and finishes in our factory and ship matching touch-up paint.
Our consultant specified Jotun (or Hempel, International, Nippon). Is that possible?
Yes. We apply the system named in your specification and keep the manufacturer’s data sheets and batch records for your file.
Which system do I need for a site near the sea?
Usually C4 within a few kilometres of the coast and C5 for seafront, port or chemical sites. We confirm after reviewing your location.
How long will the paint last?
Correctly applied C3/C4 systems are designed for 15–25 years to first major maintenance under ISO 12944 ‘high’ durability.
Do purlins need paint?
Our purlins are hot-dip or pre-galvanised (Z275 or higher). Paint is optional for appearance or very aggressive sites.
Send us your drawings – receive a priced steel package for Thailand
Structural design, fabrication, fire protection and CIF or DDP delivery in one quotation. Answer within 48 hours.