I painted some wood panels that were dark stained. I was advised here to use satinwood. I not only used satinwood but sanded a little, painted with undercoat/primer all in one and 2 coats of satinwood from Bromborough Paints (professional trade paints) I have notice already marks on the panels that have gone down to the dark stain. I only have to softy scuff the surface with my fingernail and it all comes off. I have no idea why