Hello people :) , im in the process of painting a table top., ive sanded the top (Lightly) and put an all purpose primer on top, but ive run into a spot of bother, let me explain further. the table top i have detaches from the legs, which bis handy, now looking underneath it, it is painted black, but i can see that it is real wood underneath (i can see and feel grain and knots) BUT on top it seems to be a different wood or covered in something different on top of this, there and rectangles of veneer - which the primer seems to adhere to ok, but the darker part of it dose not seem to pass the fingernail test, so it may not be the right primer, but im stumped as to what primer i would need, sanding didn't seems to make much of a difference to the dark wood barely dull it really, and im not sure its laminate or some sort of plastic... ive added a picture of the table