Noun
a dark viscous substance obtained from the destructive distillation of pine wood
Source: WordNetYes, I was in that game where George Brett hit that home run. Billy saw there was too much pine tar on the bat and he went to the umpire, the next thing we knew they were fighting about it. Bert Campaneris
Each overlap was stuffed with wool or animal hair or sometimes hemp soaked in pine tar to ensure water tightness. Source: Internet
The hull was waterproofed with animal hair, wool, hemp or moss drenched in pine tar. Source: Internet