Its currently pure carbon. I wanted to test first what the bathtub will look like, before making it to final strength. I most likely add some Lantor Soric, as using just pure carbon is a bit waste of material, as bathtub will not need ultimate strength.
For the earth bonding tip, I guess I wont need it. In the space where I have this bathtub, has no other electricity than lights.
Renting the mould can be quite difficult, As I assume U r not living in Finland. I can make U a one bathtub in reasonable price.