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How to make a sanding block
Select a wood block.
You can use a small block of off-cut wood retrieved from the scrap pile, provided it's the right shape. A rectangle is the optimal shape because it's easy to hold and covers a good area when sanding.

(1). Choose something that's the same color or different size as your sanding block. You can use blocks made from the same material, purchased or cut yourself, or create your own from the block of plywood or wood.; (2). Therefore, you should expect the back of the block to be 3-4 inches (7.6-10 cm) in size. If you've never sanded a wooden block before, bring the block of off-cut wood to the local hardware store.; (3). If needed, cut a piece of ordinary wood into a rectangle of a size suitable to hold in your hand (around 2 " x 4 "). Fold the piece of sandpaper over the sanding block.; (4). Tall blocks are ideal since they give when they are close together, and have the added benefit of providing a less bulky block to protect your home from the elements. The exact thickness measurement for a wood block of moderate thickness and similar density will differ, but generally more than 4 feet would be an ideal size.;
(3).