There is an excellent book on covering and finishing models called "There are no Secrets" by Harry Higley. I highly reccommend that you read this book for all of the information that you will need . It is available from RC Modeller Magazine and also from some Book Stores and Hobby Shops.
This is avery good reference book that you will use many times.
I think that the book is also available direct from Harry B. Higley & Sons, Inc. , P.O.Box 532, Glenwood, IL, 60425.