Menzerna are a German manufacturer of professional polishing compounds used across automotive, marine, aviation and woodworking industries. Their compounds are widely regarded as the benchmark for mirror-like surfaces — and they are increasingly popular among guitar builders and luthiers who demand the same level of finish quality on instruments.
Understanding the grades
Menzerna compounds are categorised by cutting ability — how aggressively they remove material. The system runs from heavy cut (most aggressive) through medium cut to super finish (finest). Using the right sequence is essential: start aggressive to remove defects, then step down through finer grades to refine the surface.
Heavy Cut
Super Heavy Cut 300: The most aggressive compound. Removes severe defects — deep sanding marks, heavy orange peel, oxidation. On guitars, only needed when level-sanding has left marks from 800-grit or coarser. Most finishes will not need this grade.
Heavy Cut 400: The standard starting point for most guitar and furniture polishing. Removes 1000-1500 grit sanding marks and light orange peel. This transforms a flat, hazy, sanded surface into one with visible gloss.
Medium Cut
Medium Cut 2500: The transition between cutting and finishing. Removes the fine swirl marks left by Heavy Cut 400 and begins to develop real clarity and depth. After this stage, the surface should look glossy with only faint haze visible under direct light.
Super Finish
Super Finish 3500: A fine finishing compound that removes micro-swirls and haze left by the medium cut stage. For most guitar finishes, this produces a result that is excellent — a deep, clear gloss with minimal visible imperfections.
Super Finish 4000: The finest liquid compound in the range. Achieves a true mirror finish with zero visible swirl marks, even under the harshest inspection lighting. This is the final step for show-quality guitar finishes and competition pieces.
Super Finish Solid Compound: A bar compound applied to a polishing wheel rather than used with a cloth or pad. Ideal for production polishing on a buffing machine. Produces results equivalent to Super Finish 3500 but is faster to apply in a workshop setting.
Recommended sequences
Guitar finishing (after 2000-grit wet sand): Heavy Cut 400 → Medium Cut 2500 → Super Finish 3500. For show-quality, add Super Finish 4000 as a final step.
Guitar finishing (after 1500-grit wet sand): Heavy Cut 400 → Medium Cut 2500 → Super Finish 3500 → Super Finish 4000.
Quick polish (light haze removal): Medium Cut 2500 → Super Finish 3500. Suitable for refreshing an existing finish or removing light swirl marks from handling.
Application
Apply a small amount of compound to a soft foam pad or microfibre cloth. Work in overlapping circular motions with moderate pressure, covering a small area at a time. The compound breaks down as you work — start with firm pressure (cutting phase) and reduce pressure as the compound becomes clear (finishing phase). Wipe away residue with a clean microfibre cloth before moving to the next grade.
Machine polishing (with a dual-action or rotary polisher and a foam pad) is significantly faster than hand polishing and produces more consistent results, particularly on large surfaces like guitar bodies. Use a cutting pad (firm foam) with Heavy Cut 400, a polishing pad (medium foam) with Medium Cut 2500, and a finishing pad (soft foam) with the Super Finish grades.
