The number is the spec, not the name

Most compound ranges make you guess. One bottle says heavy, the next says ultra, and neither tells you whether it'll clear 1500-grit sanding marks. Symplex skips that. Every body shop compound carries a cut number, and the number is the whole spec: Turbo X1 is Cut 7, Piranha X1 is Cut 8, Nitro X1 is Cut 9. Higher number, harder cut.

That makes the buying decision simple in a way it usually isn't. You're not comparing marketing words. You're picking a point on a scale.

All three run the same underlying chemistry — Symplex's Ultimate Premium Abrasives in a diminishing abrasive system. The abrasives break down as you work, so the compound starts by cutting and ends by refining. That's why Symplex calls these one-step products: the finish at the end of the pass is meant to be good enough to move on from.

Symplex compound comparison at a glance

Every one of them is listed safe on automotive paint, clear coat and fresh refinish work, and all three compounds come in pint, quart and gallon.

Turbo X1 — Cut 7, the medium one-step

Turbo X1 is the entry point, and for a lot of work it's also the finish line. It levels sanding marks and moderate defects, then refines as the abrasives collapse, so a single pass leaves a finish-ready surface instead of handing you a second polishing stage.

If your defects are moderate — wash marring, light swirls, finer sanding marks — start here. It's the cheapest of the three, and the one that leaves the least refining work behind it.

Cut 7 · Medium

Symplex Turbo X1 Cut 7 Body Shop Compound — $16.98

Medium-cut one-step for moderate defects and finer sanding marks. Corrects and refines in a single pass. Rotary or forced rotation, wool or foam.

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Piranha X1 — Cut 8, the true one-step

Cut 8 is a real step up in aggression from Turbo, and it's the one Symplex positions as its true one-step corrector. It pulls out heavier sanding marks than a medium cut will touch, and the ultra-leveling abrasive system still refines enough to skip a dedicated polishing stage on most colours.

That phrase — on most colours — is doing real work. Soft, dark paint shows everything. On black you'll likely still want the refiner. On a light metallic, Cut 8 on its own often finishes clean.

Cut 8 · Most shops start here

Symplex Piranha X1 Cut 8 Body Shop Compound — $20.08

The true one-step in the range. Removes defects and finishes in a single stage, with low dust and easy wipe-off for production work.

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Nitro X1 — Cut 9, for the jobs Cut 8 won't clear fast enough

Nitro X1 is a high-cut compound built to level heavy sanding scratches and severe defects on fresh refinish work at production speed. This is the bottle for a panel that's been sanded, not a car that's been washed badly.

Note the pad: Symplex lists Nitro for wool, where Turbo and Piranha are rated for wool or foam. At Cut 9 the pad is part of the cut, and a foam pad won't let the product do what it's built for.

Cut 9 · High cut

Symplex Nitro X1 Cut 9 Body Shop Compound — $23.54

High-cut compound for heavy sanding marks and severe defects on fresh refinish. Ultra-leveling abrasive keeps the refining stage short. Wool pad, rotary or forced rotation.

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Micro SHR: the step that makes the cut look finished

Aggressive compounding leaves holograms, buffer trails and micro-haze behind. Under shop lights you might not see them. Under the sun in a customer's driveway, you will.

Micro SHR is the refining stage — precision-milled diminishing micro-abrasives on a foam finishing pad, run on a DA or forced rotation. It clears what the compound left and takes the panel to a swirl-free gloss. On dark and soft paints, where holograms show worst, treat it as mandatory rather than optional.

Refining step

Symplex Micro SHR Body Shop Paint Refiner — $18.63

Removes holograms, buffer trails and compounding haze after heavy cutting. Foam finishing pad, DA or forced rotation.

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Look See Control: the step that tells you if you're done

Here's the trap that catches most corrections. Polishing oils fill what you didn't remove. The panel looks perfect in the bay, the customer parks in the sun three days later, and the marring is back — because it never left.

Look See Control is an alcohol-based panel wipe that strips those oils so you inspect the real surface. It's ready to use, pH 7.6, and it's also the required prep step before any coating goes on. Spray it on a clean microfiber, wipe the panel, flip and dry.

Inspection · Coating prep

Symplex Look See Control Prep 16oz — $14.99

Alcohol-based panel wipe that strips polishing oils so you see the true correction state. Also the prep step before a coating.

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When throughput matters more than the last 5% of gloss

The X1 range is built around finish quality per pass. The Rhino Production pair is built around panels per hour. Rhino Production Rubbing Compound is quick-cutting and fast-acting, and Rhino Production Machine Glaze clears the swirls and machine marks that fast work leaves behind.

They come in quart and gallon only, which tells you who they're for. If you're measuring work in hours per panel, stay on the X1 ladder. If you're measuring it in panels per hour, this is the pair.

There's also Ultra Polish UP3, which is a different idea again: it corrects light to moderate defects and leaves wax protection behind in the same pass. For lot work or a volume detail where a full correct-then-protect cycle isn't billable, it collapses two stages into one.

Correct + protect

Symplex Ultra Polish UP3 Polish & Wax — $16.68

Genuine one-step that removes light to moderate swirls and leaves wax protection on the panel in the same pass. Built for lot and volume work.

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Which Symplex compound do you need?

Before you compound: three honest limits

These are body shop compounds. Symplex lists the X1 range for rotary or forced rotation. That's not the same machine as the free-spinning dual action most enthusiasts own. A DA will still do useful work with Micro SHR and UP3, but it won't drive Cut 9 the way the product expects.

Compounding removes clear coat. There's a finite amount of it and it doesn't grow back. If a defect is deeper than the clear, no compound on this list fixes it — that's a refinish, not a correction.

The finish is the pad plus the product. Every result on this page assumes a clean pad. A compound loaded with spent abrasive and removed clear will haze a panel no matter what number is on the bottle.

The bottom line

Buy Piranha X1 first. Cut 8 is the widest-coverage bottle in the range and the one Symplex built as its true one-step, so it handles the most jobs without a second stage. Add Micro SHR if you work on dark or soft paint, because that's where holograms show and where a refining step stops being optional. Add Look See Control regardless — it's the cheapest bottle here and the only one that tells you the truth about your own work.

Reach for Turbo X1 when the defects are moderate and you want the shortest possible refining stage, and Nitro X1 when you're clearing heavy sanding marks on fresh refinish and you've got a wool pad on the machine.

Frequently Asked Questions

What does the Symplex cut number actually mean?

It's a relative aggression rating across the Symplex body shop range. Turbo X1 is Cut 7, Piranha X1 is Cut 8, Nitro X1 is Cut 9. A higher number removes more material faster and leaves more refining work behind it. It isn't tied to an industry-wide standard, so compare cut numbers within the Symplex line rather than against another brand's labels.

Can I use these with a dual action polisher?

Symplex lists the X1 compounds for rotary or forced rotation machines. A free-spinning DA can still do real work with Micro SHR or Ultra Polish UP3, both of which are rated for DA use, but it won't get full performance from a Cut 9 compound. If a DA is the only machine you own, start at Cut 7 with a firm pad and expect to work the section longer.

Do I still need a polish after a one-step compound?

Often not — that's what one-step means. The abrasives break down during the pass and refine as they go. But on soft or dark paint, where holograms and buffer trails show most, a refining pass with Micro SHR is what separates a correction that looks right in the bay from one that still looks right in the sun.

Which compound should I buy if I can only buy one?

Piranha X1, the Cut 8. It covers the widest band of real defects and is the one positioned as the true one-step. You can soften an aggressive compound with a milder pad, but you can't make a medium cut do heavy work.

What is Look See Control for, and do I need it?

It's an alcohol-based panel wipe that strips polishing oils off the paint. Those oils temporarily fill defects you haven't actually removed, so the panel looks better than it is. Wiping the panel shows you the real correction state before the customer finds it. It's also the required prep step before applying a ceramic coating.

Are these safe on fresh paint?

Symplex lists all of them as safe on automotive paint, clear coat and fresh refinish. Fresh refinish is specifically called out, which is what you'd expect from a body shop range. As always, follow the refinish system's own cure guidance before correcting.