Akemi ColourBond Pre-Tinted Epoxy Cartridge: An Adhesive Spotlight

A seam on engineered stone is judged from three feet away under kitchen lighting, and the adhesive line is usually what the customer sees first. Hand-tinting a knife-grade adhesive to a solid white or a warm gray quartz takes time, wastes material and depends on whoever happens to be mixing that day. Pre-tinted cartridge adhesives exist to take that variable out of the job: the color is set at the factory, the two components are metered by the cartridge, and the static nozzle does the mixing. The Akemi ColourBond Pre-Tinted Epoxy 250 mL Cartridge is one of the products built on that idea, and it is aimed squarely at quartz, natural stone and large-format ceramic slabs.

This spotlight sticks to what is actually published. Product statements come from the Dynamic Stone Tools listing for the cartridge and from Akemi’s own product page and technical data sheet for the Colour Bond line. Where those two sources give different figures, both are shown and the difference is pointed out, because a fabricator should size a joint from the data sheet that belongs to the cartridge in hand, not from a number remembered from an older batch. Around those facts, the article covers the shop practice that makes any pre-tinted cartridge work: where it fits, how to prepare the stone, how to dispense, how to clamp, and how to store what is left.

What ColourBond Is, and What the Label Chemistry Tells You

The listing describes ColourBond as a gel-like, two-component, colour-matched bonding compound based on epoxyacrylate resin dissolved in styrene. Akemi’s data sheet uses the same wording. That line deserves a careful read, because the store title uses the word “epoxy” while the chemistry statement is more specific. An epoxyacrylate resin carried in styrene behaves like a fast, reactive cartridge adhesive: the published working time is measured in minutes, not in the long open times many fabricators associate with knife-grade or flowing epoxy systems. The listing describes a 6-minute type and a 12-minute type, so plan the job around that clock, not around habits formed with a slower adhesive.

The material list is where the product earns its place. The listing recommends ColourBond for colour-matched bonding of engineered and quartz stone, naming Caesarstone, Silestone and Zodiaq as examples, as well as natural stone, ceramics and large-format techno ceramics such as Dekton, Lapitec, Neolith and Laminam. Akemi’s product page adds kitchen countertops, bathrooms, tables and window sills as typical areas of use.

On color, both sources say “more than 50” shades and neither gives a single fixed count, so this article does not either. The listing does publish the option table: black, white, red, blue, cream, beige, gray, khaki and brown families, each identified by a CC number, plus a group labelled “Magic” in transparent, white, cream, beige and gray. Neither the listing nor Akemi’s page explains in technical terms what separates a Magic shade from a standard one, so ask before assuming how it will behave in a joint. A CC number is a shade reference, not a slab brand cross-reference, and the listing does not publish a chart tying shades to specific quartz colors.

Using a Pre-Tinted Cartridge on Real Jobs

Where it fits: seams, miters and laminations

Field seams are the obvious use. A cartridge travels to the jobsite without a mixing board, hardener tube or tinting kit, and the color in the tenth seam of the week is the same as in the first. Mitered edges, waterfall legs and laminated aprons are the second natural fit, because the glue line sits on the visible corner and the joint is long, thin and tightly clamped.

The published limits are just as useful as the recommendations. Akemi states that bonds frequently exposed to humidity and frost have limited durability, and that adhesion on fresh, alkaline building materials such as concrete is only moderate. Read plainly, that makes ColourBond an interior countertop, vanity and furniture adhesive, not a first choice for exterior cladding, pool surrounds or setting stone on new concrete. The listing also says the hardened product has a very slight tendency to yellow, which is worth remembering on a pure white surface that sits in direct sun.

Choosing the shade

Match against the actual slab, not a photograph of it. Cure a small bead on an offcut from the same job, polish it the way the seam will be finished, and look at it wet and dry under the light the customer will have. Adhesive in a thin seam tends to read slightly darker than the same adhesive in a blob, and a polished surface reads differently from a honed one, so the test piece should copy the real joint. On veined quartz, match the background field, since that is the color the seam crosses most often.

Surface preparation

The manufacturer’s instruction is short: surfaces must be thoroughly clean, dry and slightly roughened. Clean means free of cutting slurry, polishing residue, sealer overspray and the oils left by hands and suction cups. Dry means dry through the edge, not just wiped; stone that came off a wet saw or CNC an hour earlier can still hold water in the cut face. Slightly roughened means a factory-polished or resin-rich face should be given a light mechanical key so the adhesive has something to grip. A fresh sawn edge on quartz usually has that texture already, but a polished mating face does not.

Dispensing with the gun and mixing nozzle

Akemi’s product page lists the mixing ratio as 10:1, and the 250 mL twin cartridge is built to deliver that ratio through a matching gun. A standard single-tube caulking gun will not do it, and a gun built for 1:1 cartridges will not either. The published sequence is specific: remove the clasp, seat the cartridge in the gun, and work the grip until material emerges from both openings. Only then is the mixing nozzle screwed on. That first step proves both chambers are flowing before the static mixer hides them from view.

Next comes the purge. The directions say to discard the first 4 inches (10 cm) pressed from the nozzle, because the leading material may not carry both components in the right proportion. Run that bead onto scrap cardboard, not onto the stone. From there, keep the bead moving at a steady pace and avoid long pauses with a loaded nozzle; adhesive that sits mixed inside the static element is on the same clock as the adhesive in the joint. Akemi also says to use only its original mixing nozzles, and warns that adhesive which has already thickened or started to gel should not be used.

Published values at a glance

The table below contains only figures printed in the store listing or in Akemi’s own documents. The strength rows show a real difference: the listing carries one set of values, while Akemi’s current data sheet for the 6-minute Colour Bond cartridge prints lower ones. For any structural decision, use the data sheet that matches the cartridge label in your hand.

Getting an Invisible Joint Inside a Seven-Minute Window

With a fast adhesive, the seam is won or lost before the trigger is pulled. Dry-fit the pieces, set the seam setter or miter clamps to the right opening, and place every tool within reach. Decide who applies adhesive and who closes the joint. On a long miter with the 6-minute type, a second person is not a luxury; a single installer running a bead down a ten-foot waterfall leg and then fitting clamps alone is spending the whole published working time on travel.

Temperature moves the clock in both directions. The directions state that curing is accelerated by heat and delayed by cold, and that all published times apply at 68°F (20°C). The listing does not print a table of times at other temperatures, so none is offered here. The listing also carries one firm instruction: the 12-minute type should not be worked below 68°F (20°C). Choose the type for the conditions, and bring stone and cartridges to room temperature before starting.

The thin-joint rule is a technical requirement, not a cosmetic preference. Akemi explains that bond layers should stay under 1 mm because the adhesive is highly reactive, shrinks by roughly 5 to 8 percent, and develops heat as it hardens. A fat joint gives that shrinkage room to pull the adhesive below the surface or away from one face, and concentrates heat in a mass of resin. A tight, accurately cut joint gives none. If a seam needs more than a millimeter of adhesive to close, the fix belongs on the saw or the CNC, not in the cartridge.

Clamp to close, not to crush. Seam setters and miter clamps should bring the faces together and hold them level until the adhesive has hardened; cranking past that point only starves the joint and can shift the alignment. Let a small, even line of squeeze-out appear along the full length as confirmation that the joint is wet from end to end. Leave the clamps in place until the published ready-to-work time for your type has passed at room temperature, and longer if the shop is cool.

Finishing is where the product’s polishability shows. The listing and Akemi both describe the cured adhesive as excellently polishable with very good surface drying, and state that grinding, milling or drilling can continue after roughly 20 to 30 minutes for the 6-minute type or 30 to 40 minutes for the 12-minute type. Shave or grind the cured squeeze-out flush, then refine the seam with diamond tooling rated for the material. Engineered quartz always requires diamond tooling made for engineered stone, and it should be worked wet with proper dust control, since dressing a seam still releases respirable crystalline silica.

One claim on the listing matters to kitchen customers: once hardened, the adhesive is described as harmless on contact with food, certified by an external German testing institute. Akemi’s documents make the same statement. Neither the certificate nor a standard number is reproduced on the listing, so request the document from Akemi if a specification calls for it. The same applies to the listing’s low-VOC figure of 12 g/L.

Cleanup, Partial Cartridges and Shelf Life

Cleanup has a hard deadline. The listing names Akemi Nitro-Dilution as the cleaner for tools while the product is still uncured. After hardening, both sources are blunt: the adhesive can no longer be removed with solvents, only mechanically or with high heat above 392°F (200°C). That means smears on a polished face should be dealt with while they are fresh, and it also means a seam that cured out of level cannot be dissolved and redone. Check any cleaner on an offcut first.

A partly used cartridge is still good stock if it is closed correctly. Akemi recommends removing the mixing nozzle after use and resealing the cartridge with its original clasp. Before fitting a new nozzle next time, confirm again that material emerges from both openings, then purge the first 4 inches as with a new cartridge. Budget one nozzle for every start.

Storage figures are published and simple. The listing gives a shelf life of approximately one year when the cartridge is stored cool and frost-free in the tightly closed original container. Akemi’s data sheet states 12 months from production in the original container, kept dry and cool at 5 to 25°C (41 to 77°F). A hot service van or an unheated trailer falls outside that range. Write the receiving date on each case, rotate stock so the oldest cartridges leave first, and reject anything that has thickened, since the manufacturer says gelled product should not be used.

Personal protection for this product is spelled out on the listing: chemical-resistant gloves, eye protection and good ventilation, with Akemi Liquid Glove named as a hand-protection option. Treat the Safety Data Sheet as the controlling document for glove material, respiratory protection, first aid and spill response; the listing does not reproduce those details and this article will not guess at them. Akemi’s product page also flags the adhesive as a flammable liquid and vapour for professional use only, so keep ignition sources away from the bench.

Building the Cartridge Kit Around It

A cartridge alone does not make a seam. The Akemi ColourBond Pre-Tinted Epoxy 250 mL Cartridge needs a matching dispenser such as the Colour Bond Dispensing Gun 10:1 Ratio 250 ml and a supply of the Akemi mixing nozzle for ColourBond and MatchBond 250 ml cartridges. For the rest of the bench, Dynamic Stone Tools groups related products under cartridge adhesives, epoxy adhesives and the full Akemi range, with seam setters and miter clamps for holding the joint while it cures.