How to: sanding block improves efficiency 10 fold!

• Folding a quarter sheet of sandpaper into thirds is an old painters trick
• But this approach using the fingers to press on the paper caused limmited pressure points and inefficiency
• By wrapping the paper over a block of wood or foam will give you even pressure over the whole contact surface.
• Use your fingers as guides to keep abrasive paper away from scratching the glass.