A kintsugi kit does not go off. It is a craft kit rather than a food product, so it carries no best before date, and there is nothing in the box that spoils. The two-part epoxy adhesive keeps well while it is sealed, stored somewhere cool and out of direct sunlight, and the gold-effect mica pigment and the two practice bowls do not age at all.
That makes it one of the easiest presents to buy months ahead. A kit bought in September and opened in January is exactly the same kit.
Why does the kit have no best before date?
Best before dates belong to food. They tell you how long an ingredient will perform the way it was designed to: how long dried botanicals stay punchy, how long wine yeast will reliably start a ferment, how long rennet will set a pan of milk. None of that applies here.
Open a kintsugi kit and you find a two-part epoxy adhesive, a spreader, a mixing card, gold-effect mica pigment powder, gloves, two practice bowls and a booklet. There is nothing edible, nothing living and nothing that dries out on a shelf. The kit is for adults only, and repaired pieces are decorative and not food safe, so do not eat or drink from a mended bowl.
How long does two-part epoxy last unopened?
Sealed, cool and out of sunlight, it keeps well. Two-part epoxy is stable precisely because it is inert until you mix it: part A and part B only start to cure when they meet each other in roughly equal amounts and are stirred thoroughly. On their own, in their own sealed tubes, they simply sit there.
Where to keep it is therefore the same advice as for any kit in our range. A cupboard indoors at room temperature is ideal. Keep it away from direct sunlight, away from heat and flames, and out of reach of children, exactly as the booklet says. Avoid the places people default to for glue and never should: a windowsill in the sun, a shelf above a radiator, or a shed that swings between freezing and baking across the year.
What about the gold pigment and the practice bowls?
The gold-effect powder is a mica pigment, from the same family of mineral pigment used in fine cosmetics and art materials. Mineral pigment does not degrade on a shelf. It can clump if it gets damp, which is the one reason to keep the pot closed and the kit dry, but it will look the same in two years as it does today.
The two practice bowls are china. They are there so you can get a feel for mixing, joining and gilding before you touch something you care about, and they are quite happy sitting in a box indefinitely. If you are giving the kit as a present, that pair of bowls is a large part of why it works as one: the recipient can have a proper go at the technique on a piece that does not matter before they repair the mug that does.
Does mixed epoxy keep?
No, and this is the one genuine time limit in the whole kit. Once part A and part B are mixed on the card, the clock is running and the adhesive is on its way to curing. There is no way to pause it and no way to save the leftovers for tomorrow.
So mix in small amounts, for the join in front of you rather than for the whole bowl. Apply a thin, even layer to clean, dry edges, press the pieces together, and hold each newly joined piece in place for 30 to 60 seconds before moving on, because the epoxy is strong but it is not an instant-grab adhesive. Then leave the repair alone to cure fully. There is no kiln and no oven involved at any point.
The other reason to mix small is tidiness. Too much adhesive oozes out of the seam, and while a bolder gold vein is a legitimate design choice, a messy one is not. Practise the amount on the bowls first.
How should you store a part-used kit?
Cap the epoxy tubes tightly and wipe the threads before you close them, so they open easily next time. Close the pigment pot. Put everything back in the box, and put the box back in the cupboard, cool, dry and out of the sun.
A finished repair needs a little care of its own. The epoxy is not waterproof, so do not soak a repaired piece, do not put it in the dishwasher, and do not use it for anything that needs to hold water, such as a vase. Dust it by hand and wipe it gently. A repaired bowl makes an excellent home for tea lights, keys or jewellery, which is all the beauty of the gold seam with none of the contact you are trying to avoid.
Can you buy a kintsugi kit long before you need it?
Yes, and people often do. With no date on the box and nothing in it that perishes, the Kintsugi Kit sits in a wardrobe as happily as it sits on a shelf. Buy it in the autumn for Christmas, or keep one in the house as a standby present, and it will be ready whenever it is needed.
The only thing worth doing in advance is a quieter one: have a quick look for the broken piece it is meant to fix. Plenty of people keep a cracked mug or the pieces of a favourite bowl at the back of a cupboard, which is usually the reason the kit lands so well in the first place.
Kintsugi kit storage FAQs
Does a kintsugi kit have a best before date?
No. It is a craft kit rather than a food product, so there is no date on the box. The sealed epoxy keeps well, and the pigment and practice bowls do not age.
Where should I store a kintsugi kit?
Indoors, at room temperature, somewhere cool, dry and out of direct sunlight, away from heat and flames and out of reach of children. A cupboard is perfect, a sunny windowsill or an unheated shed is not.
Can I keep mixed epoxy for the next repair?
No. Once parts A and B are mixed they begin to cure and cannot be saved. Mix a small amount for the join you are working on, then mix fresh for the next one.
Is an old kintsugi kit still safe to use?
The adhesive is strong and should be handled with care whatever its age. Work in a well ventilated room, wear the gloves, avoid skin and eye contact, and read the safety notices in the booklet before you start.
Can I buy a kintsugi kit months before I give it?
Yes. There is no date to worry about, so a kit bought well ahead of a birthday or Christmas will be in exactly the same condition when it is opened.
Got something broken worth keeping? Have a look at our craft kits.
