I need some advice on painting window sills in my 7 year old house. I have 4 small kids in the house and over time the window sills have gotten really grimy. I have tried sanding and repainting but now they are all tacky feeling and seem to absorb all dust and dirt. Is there a specific type of paint I should be using? What about a sealer? I am to the point of ripping them all out and replacing them with new ones that are stained. Help!!