Decorative concrete: a demanding craft
Decorative concrete and polished concrete are markets apart in construction. We are no longer talking about structural work or utility surfaces: we are talking about objects, visible floors, finishes that will be seen every day by inhabitants or shop customers. The slightest scratch, the slightest irregularity, the slightest matt veil in a polished area becomes a major defect. The polished concrete craftsman has no right to approximation.
This requirement changes everything in tool selection. A standard structural grinder does one thing: it strips. For polished concrete, you have to make several passes at different speeds, with different discs, on the same surface, sometimes alternating. Metal grit 30 strip, dust extraction, resin grit 200 grind, resin grit 400 grind, resin grit 800 grind, final grit 3000 polish. Six steps, six configurations.
Variable speed 500-4800 rpm: our signature
This is the central argument of the Sept Tools range for this market. The Petit Potam and the Tapir embed a brushless motor with electronic controller that maintains nominal torque across the full speed range, from 500 to 4800 rpm. It sounds trivial but it is technically very difficult: on a classic brushed motor, dropping to 500 rpm divides torque by three and the machine stalls as soon as you press. On a brushless with controller, torque stays constant and the machine attacks with the same force at 500 or 4500 rpm.
In practice, the craftsman moves from metal stripping at 1200 rpm to resin polishing at 4200 rpm without changing machine, without changing settings and without losing performance. This is unique on the market. Competitors offer either constant torque at fixed speed, or variable speed with variable torque, but never both together.
Diamond discs or velcro support: the choice of use
The 165 mm disc is the professional standard for decorative concrete. On the Petit Potam as on the Tapir, the disc accepts two consumable families: rigid Sept Tools diamond discs (metal, resin, hybrid) or velcro pad supports that hold soft abrasive discs. This dual compatibility eliminates the need for two machines.
For a polished concrete workshop, the winning combination is: metal grit 30 diamond discs for initial stripping, resin grit 200, 400 and 800 diamond discs for progressive grinding, velcro pads grit 1500 and 3000 for the final mirror polish. Everything on the same machine, with a few minutes of changing.
Mixing: the often forgotten first step
Before laying, there is mixing. Decorative resins and fine mortars demand controlled mixing. Too fast, you incorporate air bubbles that will resurface as craters. Too slow, you do not homogenise the pigments correctly and the colour becomes uneven. Too strong, you heat the resin and accelerate its setting, reducing application time.
The Sept Tools Premium Mixer solves these three problems thanks to its electronic variable speed. You start slowly at 300 rpm to incorporate the hardener, then progressively increase to 600 or 800 rpm to homogenise. The result is bubble-free, splash-free and perfectly uniform. The Essential Mixer offers the same logic in a more compact format for small volumes and sample workshops.
Ceiling grinding for underside decorative concrete
Often forgotten: decorative concrete is not limited to floors. More and more architects prescribe decorative concrete on beam undersides, below entrance porches or on interior vaults. For these applications, the Fouine XB165 takes over. It is the same brushless logic, the same 165 mm disc, the same finish quality, but in an ultra-light ceiling version. The craftsman can thus treat the entirety of a project (floor, wall, ceiling) with a coherent Sept Tools range.
Made in France and commercial proximity
In this high-end craft market, equipment origin resonates. End customers appreciate when the craftsman uses a French tool, designed and assembled in Roanne. It is part of the story the craftsman tells the client. And behind, our Sept Tools sales team are technicians who know the trade: they can come to the workshop for a demo, advise on which discs to use for a particular finish, or solve a technical problem live.
