Waterproofing

The prints you get out of a FFF printer are highly unlikely to be waterproof. If they are, it's mostly an accident. While there won't be a huge amount of leakage, there will likely be some. For most uses, this doesn't matter, but it could matter if, for example, you're printing a lovely vase. You need it to hold water, or the flowers will die.

To waterproof, you've got a few options:

• Epoxy resin coating. There is a Youtube video on the process.
• Wax (note, Gulf Wax melts at approximately 130F)
• Acetone (ABS, ASA, etc. not PLA/PETG)
• Silicone conformal coating (like from MG Chemicals)
• Clear spray paint, like Rustoleum Universal Clear