I was recommended to seal MDF with Zinsser 123
However after doing so, small 'filaments' of the MDF came up.
I very lightly sanded with 240 grade, and then applied a water based undercoat, but the 'filaments' came up again.
What am I doing wrong?
However after doing so, small 'filaments' of the MDF came up.
I very lightly sanded with 240 grade, and then applied a water based undercoat, but the 'filaments' came up again.
What am I doing wrong?