I am wondering how others might be preparing ACM panels.
The panels I use has a white coating in them. Not sure what the coating is.
I prep them by roughing the surface lightly with steel wool and then spraying a coat of automotive gray primer.
I let that dry for a day and then I put a thin coat of Holbein oil ground that is mixed with umber and thinned with oderless turps to a mid tone (like what mark shows in his video). (I wear a mask and work outdoors when doing this).
I am wondering if others use a coated ACM and how you prep it.