Cutlery polishing pastes: role and function

Polishing is one of the most demanding stages in the manufacture of a handcrafted knife. It's more than just an aesthetic finish: a well-polished surface resists corrosion better, facilitates maintenance and reveals the intrinsic quality of the metal. Polishing paste is the abrasive agent that makes this possible. Formulated from abrasive compounds suspended in a fatty or dry binder, it works by progressively removing the micro-spots left by previous steps - grinding, grinding, soaking.

The principle is simple: start with a coarse paste to eliminate traces of mechanical work, refine with intermediate grain sizes, and finish with a super-finish paste to obtain a mirror polish. Each grading transition must erase the scratches left by the previous one. It is the rigor of this progression that determines the final quality of the finish.

Properties and types of knife polishing pastes

Polishing pastes are distinguished by their abrasive compound, grain and optimal application medium. Mercorne's Mecapolior range includes several families.

Preparation pastes

Formulated with medium-grain abrasives, they remove marks left by fine abrasive papers (grain 400 to 800), and are used on woven cotton discs at low speed, to work evenly over the entire blade surface.

Finishing pastes

Finer-grain, chromium oxide or alumina-based compounds. They produce a satin to brilliant shine, depending on the number of passes and speed of rotation. Suitable for both stainless and carbon steels.

Superfinishing pastes

Ultra-fine formulas for mirror polish on blades, bolsters and guards. Used as final pass on felt or soft cloth. Ideal for collector's or presentation knives.

How to choose your knife polishing paste?

The choice of polishing paste depends on three parameters: the incoming surface condition, the type of steel, and the desired visual effect. Here are the key criteria.

• Initial surface condition: if a blade is still scratched after grinding, it should be prepared with a medium-grain paste on a woven cotton disc. Overdoing the process leaves defects that are invisible under a single light, but visible under grazing light.
• Steel types: stainless steels (14C28N, N690, M390) respond very well to aluminum oxide pastes. Carbon steels (XC75, 1084, damascus steel) are more reactive - prefer water-free neutral pastes to avoid oxidation during work.
• Final finish: satin polish for everyday use, bright polish for kitchen knives, mirror polish for collector's knives. Each level corresponds to one or two specific pastes.
• Application surface: each paste is designed for a specific surface. Woven cotton discs are suitable for the preparation phase; felt pads and flannel wheels are reserved for finishing and super-finishing.

In case of doubt, Mécapolior's recommended progression is available in our online guide, and Olivier answers our customers' technical questions directly.

Mercorne and Mécapolior: a partnership rooted in the French cutlery industry

Mercorne references Mécapolior polishing pastes, a French manufacturer based in Thiers, in the Puy-de-Dôme region - the world capital of cutlery. This choice is not insignificant: Mécapolior formulas are designed and tested in a professional cutlery environment, which guarantees their real effectiveness on common cutlery steels. The 15 references available cover the entire polishing chain, from the first pass after grinding to mirror super-finishing. Shipping from La Monnerie-le-Montel, free delivery on orders over €90, returns accepted within 15 days.

Frequently asked questions about knife polishes

Which polishing paste should I use first on a blade?

It all depends on the condition of the surface. If the blade has just been ground or polished with 400-grit paper, start with a medium-grit preparation paste on a woven cotton disc. If the surface is already smooth (800 grain or more), you can start directly with a finishing paste.

Can the same pastes be used on stainless steel and carbon steel?

Yes, in most cases, but with caution for carbon steel. Avoid water-based formulas that promote oxidation. Pastes with dry or fatty binders from the Mécapolior range are suitable for both types of steel, with no risk of staining.

How long does a stick of polishing paste last?

A 200 g stick corresponds to around 50 to 80 complete passes on a standard-sized blade, depending on the pressure applied and the speed of rotation. For regular workshop use, count on one stick per month for sustained production.

Is it necessary to clean the blade between each paste?

Absolutely. Rinsing with isopropyl alcohol or wiping with a microfiber is essential between paste changes. Residues from the previous phase contaminate the new paste, creating stray scratches that compromise the final result.

Do polishing pastes work by hand or only by machine?

Mecapolior pastes are designed for use on polishing lathes or column drills with disc holders. Hand application is still possible on small surfaces or for localized touch-ups, but the consistency of the result is much better with a rotating support.