Independent comparisons. We may earn from shop links. More info

How to use two part epoxy without treating five minutes as full strength

Updated: 23 October 2026

The pack is on the bench and the card says five minutes. That number is usually the time you have to place a mixed epoxy, not the time at which the joint will carry a load. A mitre kit on the same shelf is a different sequence: adhesive on one face, activator on the other, and no stirring at all. This page is those two sequences and the point where you stop. It does not rank the twelve listings. That table is the [two-part adhesive comparison](/hub/fillers-adhesives-and-sprays/two-part-adhesive). Products Compared did not bond a test piece. The notes are maker sheets and amazon.co.uk review patterns from 20 October 2026. A qualifying purchase can earn us a commission at no extra cost to you.

The pack is on the bench and the card says five minutes. That number is usually the time you have to place a mixed epoxy, not the time at which the joint will carry a load.

Our top picks

Sika Everbuild Mitre Fast 50 g, MITRE1IND

Best overall

Sika Everbuild Mitre Fast 50 g, MITRE1IND
9.2/10about £7.50
View offer
Araldite Araldite Rapid ARA-400005

Best value

Araldite Araldite Rapid ARA-400005
9.0/10about £7.85
View offer
Araldite Araldite Standard ARA-400001

Rank 3

Araldite Araldite Standard ARA-400001
7.6/10about £7.47
View offer
On this page
  1. 1.Which pack is in your hand
  2. 2.Mix, support, then wait for that pack’s clock
  3. 3.Spray, align, hold
  4. 4.The second use, and when to stop

Which pack is in your hand

Twin tubes or a double syringe are epoxy: equal volumes, mixed, then supported. A thin bottle plus an aerosol is a cyanoacrylate mitre kit. Keep those parts apart until they meet on the timber. Stirring the bottle into the spray does not make an epoxy. If both are in the cupboard, epoxy or mitre adhesive says which joint gets which pack. Araldite Rapid’s sheet wants about 20°C to 25°C. Bison’s 5-minute sheet says the epoxy does not cure below +5°C. Warm the room. Do not heat a hydrocarbon activator.

Mix, support, then wait for that pack’s clock

Clean and lightly roughen both faces, then squeeze equal volumes. Araldite’s Rapid sheet says to mix for about 30 seconds, including the edges, where unmixed resin hides. Spread a thin layer and support the joint. At about 23°C that sheet gives a pot life around 5 minutes, support for about 20 minutes, and full strength around 2 hours. If the leaflet disagrees with a web page, follow the leaflet. ARA-400005’s listing says 2 hours. Rapid 80808’s cell says 15 minutes, and one reviewer said it behaved like ordinary Araldite, so do not take a broken cell over the insert. On a clear 5 minute syringe, working time is about 5 minutes, handling strength about an hour, and full strength about 24 hours. Standard Araldite says sand or paint after 14 hours. If the mix stays tacky the next day, suspect the ratio, a cold room, or a syringe that pushed mostly one part. HSE research records skin sensitisation from uncured epoxy. Wear the gloves, and do not wash resin off your skin with solvent.
Sika Everbuild Mitre Fast 50 g, MITRE1IND

Testsieger

Sika Everbuild Mitre Fast 50 g, MITRE1IND
9.2/10about £7.50
View offer

Spray, align, hold

A mitre kit skips the cup. EVO-STIK’s mitre guide puts one drop on one face and a light spray of activator on the other, then joins the faces within about 30 seconds and holds for about 10 seconds. Ventilate. Too much adhesive foams and weakens the bond. That warning is not a reason to call the Everbuild listing waterproof. Sika’s sheet still describes about 10 seconds and a 0.2 mm gap. Align the mitre in the air. Once the faces meet, reviewers say you cannot slide them. Keep the activator off ignition sources. Store an unopened Mitre Fast kit between about +4°C and +25°C, and keep an opened bottle sealed or the nozzle goes solid. A joint you still need to move after contact is the wrong system.

The second use, and when to stop

Syringes block when resin and hardener meet in the tip, or when a cap goes back on the wrong barrel. Wipe the nozzle and replace each cap on its own side. Limino and DecorRom reviews treat many second-day failures as a blocked tip. Cyanoacrylate bonds skin in seconds. NHS Greater Glasgow and Clyde guidance is warm soapy water, then roll the skin apart with a blunt edge. Do not pull, and do not wipe the liquid with cotton wool. If it is in an eye, that is medical help. Do not put acetone on skin or in an eye. Stop for a spreading rash, a load-bearing part, a fuel or pressurised joint, or daily workshop use with no COSHH assessment. A safety data sheet is not that assessment.

Common questions

Do I mix both parts of a mitre kit?
No. The adhesive stays in the bottle and the activator stays in the can until they meet on the two faces. Mixing them in a pot does not make an epoxy, and it can set in the container. One light spray and a small drop, then align and hold. Excess adhesive is what foams.
How long do I stir epoxy?
About 30 seconds for Araldite Rapid, including the edges, until the two parts are one colour. Equal volumes matter more than a long stir. A syringe that pushes harder on one side stays weak however long you stir. Squeeze the parts separately onto a card if you cannot see both.
When is it at full strength?
Follow the leaflet in your hand. ARA-400005’s listing says 2 hours. Clear 5-minute bullets in this set say about 24 hours. Araldite Standard says 14 hours before sanding. A mitre guide can quote a 10 second grab and still put full bond strength at 24 hours. A cure cell printed as 1,524 hours is not a clock.
What if it glues my fingers?
For cyanoacrylate, use warm soapy water and roll the skin apart with a blunt edge. Do not pull, and do not use cotton wool on the liquid. For uncured epoxy, wipe the bulk away and wash with soap and water, not solvent. If adhesive is in an eye, get medical help. Do not try acetone in the eye.
When do I stop and call someone?
Stop if the part is load-bearing, if the joint carries fuel or pressure, if glue is in an eye, or if a rash is spreading. Stop for daily workshop use with no COSHH assessment. A safety data sheet helps that assessment and does not replace it. A bumper or a safety-related clip is past these consumer syringes.

Related pages

Two-part adhesive buying guide

Two-part adhesive for plastic

Two-part adhesive

Best two part adhesive for the job in front of you

Epoxy or mitre adhesive: open time or instant grab

Sources

Public UK sources used for this comparison. amazon.co.uk prices, stars and review counts were taken from the listings on 20 October 2026.

  1. Sika Mitre Fast product data sheet, August 2025 (retrieved 20 October 2026)
  2. HSE, GB classification and labelling (retrieved 20 October 2026)
  3. HSE, safety data sheets (retrieved 20 October 2026)
  4. legislation.gov.uk, retained CLP (retrieved 20 October 2026)
  5. GOV.UK, NPIS chemicals information (retrieved 20 October 2026)
  6. Araldite Rapid technical data sheet (retrieved 20 October 2026)
  7. HSE RR79, epoxy skin sensitisation (retrieved 20 October 2026)
  8. NHSGGC tissue adhesives (retrieved 20 October 2026)
  9. J-B Weld PlasticBonder (retrieved 20 October 2026)