how many undercoats?

7 Dec 2013
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United Kingdom
I am painting on new pine skirting boards and door trim - I have treated the knots with 2 coats of knotting solution (quite dark unfortunately rather than the clear or white solution..) and then 2 coats of Leyland Acrylic Primer/Undercoat.

I can still see the dark marks where the knots are, showing through the undercoats and wondered if I need to do a third undercoat or whether my topcoat of Leyland oil based Satinwood will cover them up? Or can I just spot another layer of undercoat over the dark areas?
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The OB satin will have better obliteration so do a coat and a second if required rather than a third primer/uc

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