Meguiar's Mirror Glaze M105 Ultra-Cut Compound

A small bead on a foam or microfiber cutting pad, work the panel at moderate-to-high DA speed, then wipe off — a single panel finishes in 4–7 minutes depending on defect severity. M105 is Meguiar's professional heavy-cut compound: documented in their TDS to level 1200-grit sanding marks and confirmed in community paint correction tests on hard German and Asian clears. The super micro-abrasive technology behaves as a diminishing abrasive, so it finishes cleaner than traditional rubbing compounds. Most pros pair it with M205 (Mirror Glaze Ultra Finishing Polish) for two-step correction on dark paint; on softer clears it can be one-step capable with a finishing pad.

Buy it if you're correcting hard clearcoats with deep defects (1500-grit or coarser sanding marks, deep swirls, severe oxidation) or running a two-step pro correction workflow. The cut level genuinely lives up to the "heavy-cut" positioning — it does work that medium-cut hybrids cannot. Skip it if you only need light to moderate correction — Meguiar's Ultimate Compound or 3D ONE handles softer clears with less effort — or if formula transparency matters to you, since the SDS was not located at time of review.

The 2019 EU REACH SDS classifies M105 as WARNING with H317 (Skin Sensitization Cat 1A) — driven by a trace CMIT/MIT preservative (5-Chloro-2-methyl-2H-isothiazol-3-one + 2-methyl-2H-isothiazol-3-one reaction mass, CAS 55965-84-9). This is a known potent skin sensitizer at trace levels; nitrile or chemical-resistant gloves are warranted during application and pad cleanup. No DANGER classification, no eye irritation H-codes, no respiratory hazard codes. Eye protection is recommended for mechanical splatter during DA polishing. The water-based carrier and absence of petroleum distillate keep VOC effectively below the deduction threshold; combined with CARB compliance, the environment score lands at 8.