[wouldbecouldbe]

The paper coffee cups are around 100%.

Paper is just not very good at resisting water.

[kragen]

you can use paraffin wax, beeswax, carnauba wax, or linseed oil (ideally without heavy-metal catalysts)

there are probably a lot of other alternatives that i'm not thinking of

fluorocarbons work better, are less toxic, and consume less resources because you can use less of them, but they aren't essential