I am sanding some oak veneered MDF, and on one of the pieces, I am noticing some lines that run across the grain (pictured) . They are not sanding marks because I only sanded along the grain. Do these lines appear because the veneer is too thin? Or does it have to do with how the veneer was laid on the MDF, i.e. the veneer was not pressed evenly on the sheet? I should also note that there are other pieces where the veneer is not pressed well to the MDF because you can feel/see bulges when you run your hand along the faces. I was not careful not to oversand, and thankfully did not burn through the veneer.
I would also like to know if there’s any chance that they will go away with a film finish. Thank you!