I have two interior doors which were once varnished. I've sanded them, and applied two coats of white undercoat on one door . Staining, traces of the varnish are discolouring the paint. What should I do?
Apply white gloss top coat and hope the varnish doesn't come through? Or use some sort of primer, then undercoat and then gloss top coat? Or something else?
And what about the door that I haven't yet touched? They are both too fiddly and ornate to sand further.
Thanks in advance, Martin