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Preparation · 4 min
Why primer matters before every emulsion
Primer locks alkali, improves hide and makes Keshar or Hansa last longer — skip it and you pay twice.
Fresh plaster and cement are alkaline. Without a sealer, emulsions can flash, peel or show patchiness within months.
Walltrust primers (Nira, Astra, 2in1, Multipurpose Sealer) are formulated to bond, whiten and create a uniform suction so topcoats use less paint and look even.
Rule of thumb: interior cement → Nira Wall Primer or Astra Primer; exterior / dual use → 2in1 or Multipurpose Sealer; metal → Red Oxide Metal Primer.