I was told that due to USA rules where if standard Formaldehyde glue is used in new builds there must be a warning to its occupants. As a result much MDF is now non Formaldehyde based.
If you get waterproof MDF then you're pretty safe as that doesn't contain Formaldehyde resin.
Emulsion is wet. It needs a proper basecoat sealant before using water-based paint.
No it doesn't. How do I know this? Because that's how ALL mine - many square meters - was painted.
Acrylic paint is wonderful stuff. After polymerising it becomes a very effective vapour barrier.
MDF absorbing a little water just means the paint will become a durable finish. No need for a primer or base-coat.
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