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Painting over dark patches on coving

Posted: Thu Feb 21, 2008 2:59 pm
by Farmersden
Can anyone help me.......I am trying to paint coving with white matt emulsion which is not covering dark patches left by some plastering work that was done, is there a better paint to use or should I try sanding it, any tips greatly appreciated.

Posted: Sun Feb 24, 2008 11:55 pm
by thepainterman
Use zinsser B-I-N it is a shellac based sealer,readily available from B&Q ,trade paint outlets etc.