Sewing buttons on is better than gluing them.
Crazy glue
It's hard to guess, as you haven't said WHAT you are gluing plastic buttons onto.
Super glue or Krazy glue.
super glue, it will stick acrylic pant will stick to the canvas and the super glue will stick to the acrylic paint. plus superglue is clear and won't run. your painting will look wonderful!
wit glue
You can't without wrecking the buttons - you're 'stuck 'with it now, should be more careful. (you're lucky it didn't get on the screen)
Epoxy is the type of glue to use on bakelite.
A good glue you can use for soft plastic which is a flexible material is Gorilla Glue.
White glue , Super glue . Leave it for about a few minutes for it to dry
Yes as they are measured to stick to the gums.
Silicone.
it depends on what you are using the glue for. fur instants, im doing an art project that includes feathers, silk, string, and a paper plate. then i should use hot glue. if im gluing cooked clay, i should use super glue. thx