You can sand the inside of the horns on your guitar more effectively by using sandpaper of the appropriate grit, wrapping it around a small sanding block or dowel that fits inside the horn, and using gentle, circular motions. You may also find it helpful to use a sanding lubricant, such as furniture wax or mineral oil, to reduce friction and extend the life of the sandpaper. To avoid damaging the wood, it’s important to sand evenly and not apply too much pressure. You should also frequently check your progress and stop sanding once you’ve achieved the desired level of smoothness.
- Start with a coarse grit sandpaper (such as 80 or 100 grit) to remove any rough spots or roughing in the material. Then progress to a finer grit (such as 220 or 320) to smooth out the surface.
- Clean the area frequently to remove any sawdust and to ensure you can see your progress. A small brush, such as a paintbrush, can be useful for this.
- Use a dust mask and eye protection to avoid inhaling sawdust and protect your eyes from dust particles.
- Sand in the direction of the grain to avoid creating scratches that would be difficult to remove.
- Use sanding blocks of different shapes and sizes to reach all the areas inside the horns, especially hard-to-reach corners and edges.
Remember, sanding is a gradual process. Be patient, work slowly and carefully, and check your progress often to avoid over-sanding or sanding unevenly.