Hi Jashe!
Please reach out to sales@madmayker.com for details on wholesale accounts if you’re using large quantities.
To help with your questions - you can avoid bubbles in a few ways, first ensure you are using a Jesmonite High Shear mixing blade when mixing so you don’t introduce air into your mix. When pouring, gently tap your molds to encourage settling, or encourage the use of a vibrating plate. You can also brush a coat of Jesmonite on your molds first to avoid bubbles in your outer layers.
When sanding black - you may need to wipe off sanding dust - you can do so with a damp cloth. For a deeper black, you can experiment with adding a little bit more black pigments to get the results you’re looking for!
We’re glad to hear you’re enjoying working with Jesmonite!