Introduction
This blog is about how to mix hardener and resin by hand and by mixing tube: from preparations to step-by-step guide. Some general tips will be provided later in the blog post.
Epoxy Resin and Hardener
Epoxy resin is a two-part material consisting of a resin and a hardener. When combined in the correct ratio, epoxy resin and hardener create a strong and durable substance.
What to Check Before Mixing
Prepare Necessary Tools
By hand: rubber gloves and masks, measuring cups or barrels, stir sticks, heat gun, infrared thermometer.
By mixing tube: Mixing tube.
Understand Mix Ratios
Most epoxy resin products specify a volume ratio. However, you should note that volume ratio is not equal to weight ratio.
Adjust Temperature
The ideal working environment is 70–80°F (21–27°C). If your resin has been stored in a cool place, warm it before mixing.
How to Mix Resin and Hardener by Hand
Put on Gloves and Mask
Always put on rubber gloves before handling resin or hardener.
Put on your mask, especially if working indoors or in a small space.
Measure the Two Components Correctly
Pour the resin and then the hardener into your measuring cup.
Look at the scale lines at eye level, rather than looking up or down.
Mix Slowly and Thoroughly
Stir in one consistent direction using slow, wide strokes.
Frequently scrape the sides and bottom of the cup.
Keep stirring until the mixture is clear.
Check Whether the Mixture Looks Uniform
Let the mixed resin sit for 1–2 minutes. Check the color and texture of the mixture.
How to Mix Resin with Hardener by Mixing Tube
Attach the Mixing Tube
Align the nozzle with the cartridge outlet and rotate to lock.
Confirm the nozzle is seated securely.
Prime the Tube
Dispense a small amount through the nozzle into a waste container until a uniform, streak-free bead is produced.
You can alsoview the dedicated mixing tube guide.
General Tips for Mixing Epoxy Resin withHardener
Work within your pot life: Once mixed, most epoxy resins give you 30–45 minutes before the mixture becomes too thick to spread. Mix only what you can use in that window.
Cover your piece while it cures: Dust is notorious for landing on wet resin. A cardboard box or plastic cover placed loosely over your work will protect the surface.
Don’t move the piece during initial cure: Full cure takes longer than it looks. Epoxy may feel hard to the touch in 24 hours, but full chemical cure typically takes more time depending on the product and temperature.
Conclusion
This guide covers two methods for mixing resin and hardener: mixing by hand and by mixing tube. The hand method walks through preparation, measuring, stirring technique, and a final visual check. The tube method covers attaching the mixing nozzle to the cartridge and priming it before use.
Mixing epoxy resin with hardener is a skill that improves with practice. With the right preparation and proper operations, you’ll achieve clean and professional results.
FAQs about Mixing Epoxy Resin withHardener
Can I mix epoxy resin and hardener by weight instead of volume?
Yes, but please pay attention to the proportions. For example, many 1:1 volume products require approximately 100 parts resin to 84 parts hardener by weight. If you plan to measure by weight, always check the product’s technical data sheet and read the label on your specific product.
How do I know when the epoxy and hardener are fully mixed?
The mixture should be completely uniform in color and clear. There should be no streaks, swirls, or cloudy patches. When scraping the sides and bottom of the cup, any unmixed resin or hardener must be incorporated.
Can I mix epoxy resin and hardener in cold weather?
It is not recommended. Cold temperatures slow down the chemical reaction significantly, leading to very long cure times or incomplete curing. If you must work in cooler conditions, warm the resin and hardener bottles in a warm water bath before mixing, and keep your workspace warm.