One of the most common questions before buying is how much zinc-rich paint is needed. Buying too little forces you to stop work; buying too much ties up money. Three pieces of information will give you the answer.
The three pieces of information you need
- Surface area in m². For profiles, multiply the perimeter of the section by the length.
- Number of coats. 2 coats are recommended; 3 in marine or highly aggressive environments; 1 for touch-ups.
- Coverage per coat. GALVANOL uses approximately 250 g/m² per coat for 40 microns dry, undiluted.
The formula
kg required = m² × coats × 0.25
Real examples
- 10 m railing with 40 mm tubing and bars (≈ 4 m²) at 2 coats: 4 × 2 × 0.25 = 2 kg → one GALVANOL 2 kg container.
- Roofing structure of 40 m² at 2 coats: 40 × 2 × 0.25 = 20 kg → two GALVANOL 10 kg buckets.
- Welding touch-ups (≈ 1 m²): one GALVANOL Spray 500 ml covers approximately 1 m² at 40–60 microns.
Factors that increase consumption
- Very rough, pitted surfaces, or those with heavy rust.
- Outdoor spray gun application in windy conditions (overspray losses).
- Profiles with many edges, screws, and joints.
As a rule of thumb, add a 10–15% margin. If you prefer not to do the math, use our How much GALVANOL do I need? calculator: enter the m² and it will tell you which sizes are the most cost-effective.
Ready to protect your steel?
GALVANOL contains 96% zinc in its dry film, has been tested in an ENAC-accredited laboratory according to ISO 12944, and complies with ISO 1461 and ASTM A780. We manufacture it in Spain and ship it within 24–72 hours, free of charge to mainland Spain and the Balearic Islands on orders over €50.
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