Long Life Sanding Wood and Paint! Sometimes there’s no substitute for hand sanding. The problem was that conventional sanding sheets wore out fast, clogged, or broke when sanding curves and edges. The old solution was to buy a lot of sanding sheets, leading to high consumption and waste. The new solution is sanding foams using Bosch Surface Structure. With one rounded edge and a sharp-angled side, this sanding sponge set makes hard-to-reach areas easily accessible and sandable. The Bosch EXPERT Sanding Foam Combi Block is a revolution in hand sanding. Once you’ve tried it, you won’t look back.