Substance used to make ships or hot-air balloons heavier and more stable

Let's find possible answers to "Substance used to make ships or hot-air balloons heavier and more stable" crossword clue. First of all, we will look for a few extra hints for this entry: Substance used to make ships or hot-air balloons heavier and more stable. Finally, we will solve this crossword puzzle clue and get the correct word. We have 1 possible solution for this clue in our database.