Should I Undercoat Before Glossing

first treat the knotts then use a primer/undercoat 2 coats is best then top coat of gloss. if painting wood that is already painted you can just rubb it down a little then gloss if you are using a good gloss but of course one coat of undercoat would be best first.

Do I need undercoat under gloss?

It’s always better to use an undercoat before applying gloss. ‘ Emulsion mostly refers to paint used for walls and ceilings.

Do you need undercoat when repainting?

It’s essential to use the correct primers and undercoats to allow paint to do its job properly. Undercoat is often required to seal unpainted surfaces or prepare the surface for painting. If you are transitioning from a dark to a light colour, the undercoat will help to obliterate the colour beneath.