You can sand, but you don’t have to worry about anything minor because the next coat of epoxy helps too. But You can certainly sand down a less attractive area.
Unfortunately, I don’t think that would work well. The wet epoxy allows you to dab on the mica and then pull it to streak it out. With tack it, once you dab it on there it’s stuck down. If you want to experiment you could always try it on a piece of scrap vinyl to see how it would look before doing it on your cup.
It’s super easy! It only looks like it’s complicated when it’s finished, but it’s honestly as easy as dragging a paint brush through it. I’m sure yours will be fabulous! Be sure and post it somewhere on socials and tag me so I can see it! 🩷
