This book is adequate, but you will learn far more if you also invest in a non-RYA book as complimentary reading.I recommend Windsurfing. If you read RYA Start Windsurfing, RYA Intermediate Windsurfing and the Peter Hart book you should be able to teach yourself.
Sticks well, great grip, holding fast in sea water. This really helps on my windsurfer, and is much better than board wax as I can put the grip where I need it. I use the squares next to the mast foot to add grip.