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When substituting steel wool for sandpaper, it's important to choose the right grade of steel wool to match your task. Blanchi Costela/Moment/Getty Images.Steel wool can replace fine sandpaper in many sanding tasks. Its fine strands cut into the surface, removing a very thin layer. One advantage of steel wool over sandpaper is its ability to compress into various shapes, allowing it to reach tight spots and work on intricate designs such as bevels or moldings with ease.
Steel wool comes in several grades, ranging from the roughest, grade 5, to the finest, grade 0000. The coarser grades are perfect for removing paint, varnish, or finish from wood, preparing the surface for further treatment. Finer grades are ideal for delicate tasks, such as sanding between coats of finish (cutting back). The finest grades are also excellent for 'rubbing out' the final coat of a finish, leaving a smooth, satiny texture as they cut into the surface rather than scratching or tearing. For best results, use short strokes around edges and long, smooth strokes along the grain on large flat surfaces.
One downside of using steel wool is that it can rust when exposed to moisture. This makes it unsuitable for use between coats of water-based finishes or paints. Small fragments of steel wool can break off during sanding or rubbing, and if left behind, they could cause rust stains. Additionally, it’s not advisable to use steel wool on plaster, as the pieces may become embedded and rust. However, this issue can often be resolved by carefully cleaning the surface with a soft cloth or using a magnet to remove any leftover steel wool fragments.
