I want to know the answer to the following question:
For what was most of the the Bitumont plant's output was used for waterproofing?
All the background I'm provided with is that "Most of the bitumen was used for waterproofing roofs, but other uses included fuels, lubrication oils, printers ink, medicines, rust and acid-proof paints, fireproof roofing, street paving, patent leather, and fence post preservatives.". Is that enough to answer the question?