I was prepping Dibond after I coated it with primer and the primer came off.?!!
I had lightly roughed up the Dibond with steel wool. Wiped it down and coated the Dibond using Rustoleum 2X gray primer. I let it dry for four days. I mixed up a thin combination of Holbein oil ground (white) with burnt umber. When I brushed it on the gray primer got gooey and mixed with the paint.