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Books for the professional decorative painter, faux finisher
By an Amazon.com customer
Professional Painted Finishes: A Guide to the Art and Business of Decorative Painting (Whitney Library of Design)Professional Painted Finishes: A Guide to the Art and Business of Decorative Painting (Whitney Library of Design) by Ina Brosseau Marx
Buy used from: $4.68
Absolutely the best book for the professional or those wanting to become one.  Very detailed instructions with pictures.  Also, section about running a professional business.
The Art of Faux: The Complete Sourcebook of Decorative Painted Finishes (Crafts Highlights)The Art of Faux: The Complete Sourcebook of Decorative Painted Finishes (Crafts Highlights) by Pierre Finkelstein
Buy new: $29.70 / Used from: $20.00
Great book, a lot of information and techniques.  All techniques have a difficulty rating to help you pick which technique to get started with.
Decorative Style: The Most Original and Comprehensive Sourcebook of Styles, Treatments, TechniquesDecorative Style: The Most Original and Comprehensive Sourcebook of Styles, Treatments, Techniques by Kevin Mccloud
Buy used from: $0.01
This is my favorite of Kevin's books.  I appreciate using the book as a referance when choosing finishes for specific home themes.
The Gilded Room: Decorating with Metallic Effects, from Metal Leaf to Powders, Pastes and PaintsThe Gilded Room: Decorating with Metallic Effects, from Metal Leaf to Powders, Pastes and Paints by Kerry Skinner
Buy used from: $59.97
For anyone who has not been a fan of metal type finishes, this book will convert you.  A wealth of information on using metal leaf, powders, paints and more.