I have used two different wood paints in our living room. One is a white wood primer and the other is a white MDF primer. I was hoping that with the same white satin paint as top coats they would end up the same colour but the MDF primer cupboard is much whiter than the rest of the woodwork. Would I be able to use the normal wood primer on the cupboard and then do another coat of satin? Also we have artex on our hallway walls which we want to get rid of. What is the best way to do this?