by thedoctor »
Mon Jun 04, 2007 10:59 am
They don't block heat they send it into the middle of the room where its required instead of allowing it to fly straight up the wall where it isn't. If the box is MDF, as most of them are, you need to prime it properly first with MDF primer. See our project on painting MDF. When primed you can paint it with what you like.