Water Gold Size is a traditional size for illumination made with natural gums with a rich yellow colour, which provides a good base colour for laying gold leaf over. It flows less easily than either Ormoline Gilding Medium or Gum Ammoniac and is best applied with a brush. Just paint the area you wish to gild with the size and allow around 10 - 20 minutes for the size to reach tack before applying the gold; if the size dries out too much then reactivate it by breathing on it.