Menzerna Heavy Cut Compound 1000

Menzerna numbers its polishes by their place in a four-step system, and this one is step one at its most aggressive. Put a few pea-sized drops on a heavy cut foam pad, work a 40 by 40 centimetre section with firm, even pressure at a constant low speed, and the milky film gradually turns to a slightly translucent oily sheen. That colour change is the signal it has finished working. Wipe the residue off with a microfibre while it is still fresh and the sanding marks and heavy wear are gone.

What is left behind is a corrected but dulled surface. That is intentional, and it is why the panel then goes to a medium-cut polish and a finish before it looks like anything. Detailers on AutoGeek describe it as a very aggressive cutting compound and agree it comes good only once those later stages have run. Judge it on how much it removes and how quickly, because that is the only job it was designed to do.

The right buyer already owns the rest of the process: a full-size machine, a heavy cut pad, a medium-cut polish and a finishing polish, and a panel with sanding marks, overspray or damage severe enough to justify starting this far up the scale. Anyone refinishing after wet-sanding is exactly who this was written for. Skip it if you want one bottle that corrects and shines, because that is a different product and Menzerna sells it: Heavy Cut Compound 400 is rated 8 for cut and 8 for gloss and finishes in a single stage. Also think twice if your only machine is a small 3-inch orbital, or if the paint is thin or has already been corrected several times, since the most aggressive step in the line is the wrong place to start on a clear coat with little left to give.

The safety data sheet on file classifies the mixture for serious eye irritation and nothing else, with a WARNING signal word, and Section 8 names safety glasses. Compound thrown off a spinning pad is the realistic way it reaches an eye, so that recommendation earns its place. Section 8 declines respiratory protection, but only on the condition that the room is well ventilated, which is why the lungs row is carried as a situational one: the petroleum carrier is around 12 percent of the mass and builds up over a long session in a closed garage. Gloves are named for short-term contact, alongside a warning not to wear them where they could be caught by a rotating machine.

Worth knowing that two safety data sheets exist for this product and they disagree. A 2015 US sheet says the mixture is not classified under GHS at all; the 2019 European sheet classifies it for eye irritation. The newer and more cautious of the two is the same document, so that is the one hosted here and the one the score reflects.

On Proposition 65, Menzerna's own California ingredient disclosure names ethylene oxide as a nonfunctional constituent and flags it as listed. It is a trace residue from making the emulsifiers rather than a deliberate ingredient, and no concentration is given. Amazon returned no answer when the listing was checked, and no answer is not the same as a clean one, so the warning stands. Environmentally, the emulsifier system is classified as toxic to aquatic life at ingredient level even though the finished mixture carries no aquatic hazard code, and the volatile content works out to roughly 178 grams per litre from the figures in Section 9.