Note: Dura-Block® is not a Mirka® brand but compatible with Mirka® abrasive products and will help you achieve a perfect finish.
Dura-Block offer the most comprehensive range of blocks available. Dura Block's are made from closed cell EVA foam and are computer numerical control machined (CNC) from a solid material for accuracy and longevity.
Block sanding can be considered an art in itself and a little overwhelming. Most surfaces on a car or boat are made of curves - a long major curve and a minor secondary curve. Once these curves are identified, then it's a matter of sanding at 45 degrees to each curve. The nature of a block will constantly take the average of the surface and only sand on the highest points until a perfect surface is achieved.
For best results always use the largest block possible for each section to be worked on and match the size and shape of the block to the surface. Dura-Block's are ideal for dry coarse sanding through to final wet sanding, helping you achieve a perfect finish.