The plasterboard on a project I finished a while ago have yellowed a little. Is there a specific undercoat application for this issue?

The Australian Standard AS/NZS 2589 states:

Installed gypsum plasterboard linings shall have a coat of waterborne wallboard sealer except where the lining surface has yellowed due to exposure to sunlight where a coat of solvent-borne sealer as specified in AS 3730.22 shall be applied prior to any further treatment.


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