ZviZZer HC 4000 "Heavy Cut" Cutting Compound (Red) 250ml

Pull deep scratches and oxidation out in one strong cut

What is the ZviZZer HC 4000 Heavy Cut? A water-based cutting compound on the second-highest cut grade that removes deep scratches, sanding marks from P2000 grit upward and oxidation from weathered paint. It deliberately leaves a light haze and is not the finish — a medium or finishing polish comes after it.

ZviZZer HC 4000 Heavy Cut is a water-based cutting compound from ZviZZer with strong cut, marked Red in the five-step colour system and slotted as the second-highest grade between Pre Cut and Medium Cut. Its high share of homogeneous aluminium-oxide grit cuts fast and evenly instead of scratching, and works out deep scratches as well as sanding marks from P2000 upward. It is silicone- and solvent-free and made in Germany.

• Second-highest cut in the five-colour system. Red sits one step below the blue Pre Cut and one above the orange Medium Cut. The HC 4000 takes out sanding marks from P2000 grit and deep scratches that a one-step polish leaves behind — the fast way from weathered paint to paint you can actually correct.
• Fast cut from a high grit share. The high share of very homogeneous abrasive grit gives you cut in 1 to 2 passes plus a decent gloss on top, so the finishing step after it runs shorter. On a rock-hard cured clearcoat we closed scratches in two passes with the red pad that the fingernail clearly caught.
• Two sizes for the damage area and the season. The 250 ml bottle is enough for spot scratches and smaller corrections, the 750 ml bottle covers the full reconditioning of weathered cars and steady use. A pea-sized amount covers a pad area of about 40 by 40 centimetres.

Day-to-day from Detailing1: The most common mistake with a heavy-cut compound is reading the haze as a fault and trying to buff it away with more product. The light haze is part of the plan — a coarse cutting compound cuts, it doesn't finish. Spread a pea-sized amount at about 1,000 rpm, work it out at up to 1,800 rpm with medium pressure, and then firmly plan in a pass of medium or finish afterwards. Skip the second step and the haze shows up at the latest in direct sunlight.

Spread at 1,000 work out at 1,800 then refine

You spread the HC 4000 pea-sized at about 1,000 rpm on the damaged spot and then work it out at up to 1,800 rpm with medium pressure, until the scratches are closed and the cut is there.

The prerequisite is clean, decontaminated and masked-off paint. Otherwise leftover tar or fallout settles into the pad and drags fresh scratches into exactly the area you're correcting. Wash the car, clay it, and mask sensitive edges and trim beforehand.

The HC 4000 shows its strength on a hard red polishing pad with strong cut or on lamb's wool, not on a soft finishing sponge. For the red cutting compound the maker recommends a pad in the same system colour, such as the hard Thermo Trapez pad in 125 millimetres. Work in sections of about 40 by 40 centimetres so the grit acts for the same time everywhere.

Keep the pad clean: after two to three sections knock the polishing dust out or swap the pad, otherwise a clogged pad smears and the cut stalls. From our KB day-to-day the rule of thumb is that wool and hard foam carry the strong cut, while too soft a pad overheats the friction and stresses the paint instead of cutting it.

Plan the second step in from the start. The HC 4000 preps the surface perfectly for the MC 3000 that follows, that's its intended spot in the flow. After the cut, wipe down with a splash of isopropanol, check the real result under the polishing oil, and then set up the medium or finish grade.

Paint temperature decides the pace. Below about 15 degrees the water-based grit grabs more stubbornly and the cut takes longer — then a touch more rpm rather than more product. In full sun, on the other hand, the film dries too early; work in the shade and on a cool surface, otherwise the compound dusts and the cut comes out uneven.

Deep scratches yes the finished look no

The HC 4000 reliably cuts deep scratches, sanding marks from P2000 and oxidation — the high-gloss, hologram-free end state it deliberately does not deliver, it's the stage before that.

Its core ground is heavy correction: badly weathered, matte or fingernail-deep scratched paint that needs real cut before gloss is even on the table. It suits all paint types, including scratch-resistant as well as fresh and cured paint. On a badly weathered bumper one pass rarely does it — there we needed two passes until the oxidation haze was gone.

The difference in grit is the fastest signpost. Sanding marks from P2000 and deep scratches are the red HC 4000's turf. Fine swirls and holograms from about P3000 already fall to the milder orange grade. If you clearly catch the defect with your fingernail, Heavy Cut is right; if not, it's too coarse.

The limits are drawn clearly. If the scratches sit even deeper and the HC 4000 doesn't close them in two passes, the even stronger blue Pre Cut compound belongs in front of it. If there are only light swirls, the HC 4000 is too coarse — then the milder one-step polish is enough, correcting and bringing gloss in a single step.

A second edge case is soft clearcoat. Japanese and some modern paints are so yielding that a coarse cutting compound leaves more haze there than you'd need. On surfaces like that, start one grade milder and rather plan in a second pass than take off too much at once with Heavy Cut. The haze gets removed with medium or finish in every case, never left standing.

On widespread oxidation the HC 4000 plays its strength to the full. A paint gone matte and chalky after years without protection can barely be saved with a mild polish, simply because the initial cut is missing. Here the strong red grit takes off the top, damaged layer and exposes the intact paint underneath — the base on which a later gloss build can hold in the first place.

For heavy correction not the quick wash

The HC 4000 is the right call when paint needs real material removal and you want to remove the defect instead of hiding it under gloss. It's a tool for the damage case, not a weekly care item.

It's less suited to two situations: the regular refresh of well-kept paint, for which it's simply too aggressive, and concours reconditioning as a single product, because finishing grades run at the end anyway. If you need the full spectrum long term, you're better off with the graded ZviZZer system from Pre Cut through Heavy and Medium to Ultra Fine than with a single grade.

One question that keeps reaching us in support is whether beginners can use a polish product like this safely. With a coarse cutting compound the honest answer is: carefully. It removes noticeable material and forgives less than a one-step polish, especially on edges where the clearcoat is thin and burns through fast.

Money-wise the choice works out over the bottle size. For a couple of spot scratches on the bumper the 250 ml bottle is enough and you use it sparingly. If you're correcting a fully weathered car or several cars a season, the 750 ml bottle works out cheaper, since a pea-sized amount already covers 40 by 40 centimetres of paint.

The one point the grade chart doesn't tell you: the HC 4000 is no stopgap for gloss chasers, it's brutally honest and cuts off what you give it. Test it on a hidden spot, check the real result under the polishing oil with a splash of isopropanol after the cut, and only then decide on the cut strength of the next step. That control check is exactly what separates a closed correction from paint that looks scratched again after the first wash.

Application of ZviZZer HC 4000 Heavy Cut

From weathered paint to a clean pre-correction stage

Before sanding, the paint must be clean: washed, decontaminated, and masked at the edges. Residues of tar or industrial fallout will otherwise get into the pad and cause new scratches on the surface you are trying to correct.

Apply a pea-sized amount of HC 4000 to the hard red polishing pad or to a lamb's wool pad, distribute it over the damaged area at about 1,000 rpm, and then work it in at up to 1,800 rpm with medium pressure until the scratches are leveled and the paint has been removed.

Work in sections of approximately 40 by 40 centimeters and brush out or change the pad after two to three sections. A clogged pad will only smear and overheat due to friction. For heavily weathered surfaces or deep scratches, two coats are normal—a second pass is more effective than using more material in one.

The HC 4000 intentionally leaves a slight haze. You can remove this afterwards with the orange MC 3000 or a yellow finish polish. Before re-polishing, wipe the surface with a splash of isopropanol to check the actual correction results beneath the polishing oils.

Notes: The HC 4000 is the second highest abrasive grade and removes deep scratches as well as sanding marks from P2000 grit upwards. If it does not close the scratches even in two coats, the more powerful blue Pre-Cut sanding polish should be used beforehand, followed by medium or finish polish. It is too coarse for light swirls only—a one-step polish is sufficient there. On soft clear coats, work one level milder. Store in a cool, frost-free place and use within 24 months of opening.