I have a set of bunk beds that are real wood (medium brown color). I want them to be black. They were factory done – no DIY refinishing has been done on them before. They are stained now. Should I paint them black and if yes, how do I prep them for the paint to be lasting in a little boy’s room? Or, should I use a black gel stain? I’ve never worked with gel stain so any input would be appreciated. Thanks!