How To Polish Steel: Part 3 | 320 Grit Wet & Dry Sandpaper

This guide details the process of polishing steel using 320-grit wet and dry sandpaper, following a previous 220-grit step. The instructor emphasizes using a light oil or lubricant to prevent rust and explains how to feel for surface imperfections as they are smoothed out. The importance of using fresh sandpaper as grit wears down is also highlighted, with the goal of achieving a noticeable reflection on the metal surface.

Quick Summary

To polish steel after using 220-grit sandpaper, move to 320-grit. Use a light oil lubricant like WD-40 to prevent rust. Sand with a flat tool using back-and-forth motions, feeling the surface for smoothness. Be aware that grit wears down, so fresh sandpaper may be needed for extensive work. A slight reflection will begin to appear on the steel.

Chapters

  1. 00:00Transition to 320 Grit
  2. 00:06Introducing 320 Grit Sandpaper
  3. 00:13Sanding Tool and Lubrication
  4. 00:26Lubricant Choice: Oil vs. Water
  5. 00:32Sanding Technique
  6. 00:42Feeling the Surface Smoothness
  7. 00:54Grit Wear and Sandpaper Longevity
  8. 01:13Visualizing the Polish
  9. 01:26Next Steps: 400 Grit and Beyond

Frequently Asked Questions

What is the next grit of sandpaper to use after 220 grit for polishing steel?

After using 220-grit sandpaper, the next recommended grit for polishing steel is 320-grit. This finer grit helps to further smooth the surface and prepare it for even finer polishing stages.

What type of lubricant is best for polishing steel with sandpaper?

For polishing steel with sandpaper, a light oil like WD-40 is recommended. While water can be used, it carries a significant risk of causing the metal to rust during or after the process.

How can you tell if you are effectively polishing the steel surface?

You can tell if you are effectively polishing the steel surface by feeling the change under your sanding tool; it will become smoother. Visually, you will start to see a reflection appear on the surface as imperfections are removed.

Does sandpaper grit wear out, and how does it affect polishing?

Yes, sandpaper grit wears down with use. As the grit wears, the sandpaper becomes less abrasive, effectively acting like a finer grit than initially intended. For consistent results, it's advisable to use fresh sandpaper for extended sanding tasks.

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