Practical advice for scale model builders
Use a flathead razor blade or a scalpel with a sharp, flat edge for scoring and cutting small plastic or resin parts. The thin, flexible blade allows for precise control and minimizes the risk of damaging surrounding details.
For cutting metal or thick plastic, use a jeweler's saw or a fine-toothed hobby saw with a fresh blade. Apply gentle, consistent pressure and saw in a smooth, back-and-forth motion, using a sawing motion that is perpendicular to the cutting edge.
Use a flat file for deburring and smoothing large areas, and a round file for radiusing edges and corners. For more precise work, use a half-round file for curved surfaces or a flat file with a fine tooth for detailed work on small parts.
For fine polishing, use a 240-320 grit wet/dry sandpaper or a 1200-1500 grit polishing paper. Apply a small amount of water or polishing compound to the sandpaper and work in a circular motion, using gentle pressure to avoid scratching the surface.
To maintain a sharp blade on a hobby saw or jeweler's saw, use a diamond stone or a water stone with a fine grit (e.g., 6000-12000) to sharpen the blade to a 20-30° angle. For flathead razors or scalpels, use a ceramic hone or a leather strop to maintain a sharp, straight edge.