Hide Glue Preperation and use.
Glue brushes-acid brushes for soldering work good and are cheap, if a wider brush is needed use a real hair brush, cut short, also thin wood spreaders are used, use scrap from guitar backs. A source of Hide glue in large quantities is Milligan and Higgins P.O. Box 506, Johnstown, New York, 12095-0506. I use 315 TG. Do your gluing at 45% humidity, if possible.