With pitch, gum, or grease, they covered up the cracks or seams.
Here is a piece of gum benzoin, the substance from which Friar's balsam is made.
Dissolve the gum and honey in it, and strain it through muslin.
Then, so an English writer tells us, a use was found for the gum—and a name.
For marbling books or paper, dissolve four ounces of gum arabac in two quarts of water, ...