Can you paint directly onto wood?

Use a furniture refinisher to dissolve the stain and scrub it away with a bit of steel wool. Although it still involves some scrubbing, this approach is less damaging to...

No. If you put the mug in the dishwasher, there is a high probability the paint will come off.

Yes, you can paint directly over brick. I would recommend washing it first, and if you're using regular paint, you should also use a masonry primer.

You can, but the paint could eat through the canvas or cause chips in the finished piece. It's best if you apply a base coat of gesso first.

You need to prepare the wood before you begin painting. Start by sanding the wood and then putting two layers of shellac on the piece to be safe. You can...

No, it should be dry in about 24 hours if it's a thin coat.

Yes, of course.