From iron gates to steel structures, galvanized sheet to aluminium — correct painting methods for metal surfaces. Anti-rust primer selection and long-life system recommendations.
70% of metal painting success comes from pre-application surface preparation. Remaining oil, rust or old paint can completely prevent adhesion.
| Metal Type | Cleaning Method | Primer Type |
|---|---|---|
| Raw steel / iron | Mechanical or chemical abrasion | Epoxy or alkyd anti-rust |
| Galvanized sheet | Phosphate cleaning + sanding | Chlorinated rubber or etch primer |
| Aluminium | Solvent cleaning + sanding | Wash primer or etch primer |
| Old-painted metal | Remove peeling sections | Compatible intermediate primer |
| Environment / Use | Recommended System | Expected Life |
|---|---|---|
| Interior metal door | Alkyd anti-rust + alkyd enamel | 8–12 years |
| Exterior iron railing | Epoxy anti-rust + PU topcoat | 10–15 years |
| Industrial steel structure | 2K epoxy + 2K PU | 15–25 years |
| Roof sheet | Alkyd anti-rust + silicon topcoat | 7–12 years |
| Marine steel | Zinc dust + epoxy + PU | 15–20 years |
MST Anti-Rust Red · MST Anti-Rust Grey · MST Hammer Effect · MST Industrial Epoxy 2K · MST High-Temperature Paint (to 400°C)
Can paint be applied directly over rusty surface?
Rust converter can be used for light surface rust, but mechanical abrasion is essential for optimal results.
Which primer for galvanized sheet?
Zinc on galvanized is alkaline — most alkyd primers won't adhere. Etch primer or phosphate primer is mandatory.
How long until metal paint fully cures?
Surface dry: 2–4 hours; full mechanical cure: 7–14 days. Don't apply physical stress before full cure.
Why is 2K paint better?
The cross-linked structure formed with the hardener delivers far higher chemical and mechanical resistance than single-component paints.
