Several years ago I agreed that my teen daughter could decorate her room with designs, drawings, poems etc. (Well it kept her out of mischief and she's artistic.) She has grown out of this and decided to decorate. She had done the designs with permanent marker. Money is tight so she used paint we had. First wall- dulux once, she panicked when she saw it wasn't covering and just kept piling it on. Result-a rock hard very bumpy mess with some marker still bleeding through. Second wall - dulux once put on in thinner layers allowing to dry between.- result-all marker bleeding through. Third wall (after her confession of the mess she'd made and some research)- vinsser stainkiller- result dramatic smudging and original drawing still bleeding through. Now all this has only been done where there was drawing so in addition we have patches of the original light blue to add to the overall effect. Any chance of a cheap and quick solution to our considerable woes?