Hi all. I have been building model kits for years now but I've never understood all of the modelling related jargon. I've always assumed that I've been building and painting correctly until now, so I have a few questions. Why do I need to clean the plastic kits before building? Is this important? I've heard about Priming but what is it? Again, is it important? And finally, what paint type is best to use? Enamel or acryllic? I'm not sure which type of paint is in the little pots that are included with some airfix kits so i've just gone with them and found them to be adequate. Thanks.