What type of primer is recommended for aluminium surfaces?

Zinc chromate primer conforming to IS 104 or a suitable wash/etch primer to ensure proper adhesion.

Is painting mandatory for copper or lead in buildings?

No, they possess high natural corrosion resistance. Painting is done primarily for decorative purposes or to prevent green staining on adjacent surfaces.

What is the primary challenge when painting non-ferrous metals?

Poor paint adhesion due to their smooth surface characteristics and lack of mechanical key.

IS 2524

: 2000

Code of practice for the painting of non-ferrous metals in buildings, Part 2: Painting

CurrentSpecializedCode of PracticeArchitectural · Building Construction Practices incl. Painting, Varnishing

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This standard provides guidelines and schedules for the painting of non-ferrous metals like aluminium, zinc, copper, and lead in buildings. It specifies the types of primers, undercoats, and finishing coats required to ensure proper adhesion, protection against corrosion, and aesthetic quality.

Code of practice for the painting of non-ferrous metals in buildings, Part 2: Painting

Quick Reference Values

recommended minimum finish coats2 coats

minimum primer coats1 coat

Practical Notes

Non-ferrous metals lack a adequate mechanical key; hence, proper pretreatment (as per Part 1) or the use of wash/etch primers is critical for paint adhesion.

Copper and lead are typically only painted for decorative purposes or to prevent run-off staining on adjacent masonry, rather than for corrosion protection.

Ensure surfaces are completely dry and free from grease, oil, or oxidation products before primer application.