How many coats of undercoat?

12 Jan 2010
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United Kingdom
I'm going to paint some woodwork with oil-based eggshell. I've used it before and put 1 coat of undercoat on before 2 coats of the eggshell. But I've seen quite a few people say they put 2 coats of undercoat on and then 1 top coat.

Is that method preferable? And if so, why? Thanks.
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I'd personally knot treat it then undercoat once then overcoat twice like you said you did before. If you were using a one coat paint, two undercoats would give a better base for the one coat to work.

Eggshell does not require undercoat, treat the knots then prime followed by 2 coats of eggshell.
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