Are pencil rubbers always impossible to find when you need them?
Twist a rubber band around your finger to erase pencil marks. Or roll some putty into a ball.
Cover errors on coloured paper - hand-lettered invitations and school projects, for example with a dab of the acrylic paint used for model airplanes, if you have some. Choose matt paint and mix the colours until you have an exact match for the paper.
