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Zinsser 123 but there's a new + version that is more opaque which I've been using for a year or 2.
If you can polish the edges of the MDF to around 400 grit it makes priming them as easy as priming the flat surfaces.
[https://www.screwfix.com/p/zinsser-bulls-eye-1-2-3-plus-primer-white-2-5ltr/756JG?
Airhead
@iamalex
Any recommendations for MDF primer?
We’ve had some cupboards built so just bare MDF. Planning to prime, seal coat, topcoats.