12 Essential Rules for Mixing Epoxy Resin (Avoid Sticky, Soft, or Uncured Projects)

Mixing epoxy resin might seem intimidating at first, but with the right steps and setup, it becomes a smooth, creative process you’ll actually enjoy. This guide walks you through every stage—from prepping your workspace to pouring and curing—with clear instructions designed for beginners. One of the most important things to remember before you start: make sure your room temperature is set to around 73°-78°F. Resin reacts best in this range, helping you avoid bubbles, streaks, and curing issues. Also, it's best to warm your resin bottles in a water bath at a temperature of 80°-90°F for 15 minutes prior to mixing. Ready to mix with confidence? Let’s dive in. 

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12 Rules for Mixing Epoxy Resin 

1. Follow the Manufacturer’s Ratio Exactly

• Every brand has its own required ratio (commonly 1:1 or 2:1).  
• Measure by volume or by weight only as instructed — never switch methods.  
• Even small ratio mistakes can cause soft, sticky, or uncured resin.

2. Make Sure Both Parts Are the Same Temperature

• Ideal resin temperature: 70°-75°F.  
• Cold resin = thick, bubbly, and hard to mix.  
• Warm bottles in a 80°-90° water bath (sealed) for 15 minutes before mixing.

3. Mix Slowly, Not Vigorously

• Stir with a steady, gentle motion.  
• Scrape the sides, bottom, and corners of the cup constantly.  
• Fast stirring traps air and creates microbubbles.

4. Mix for the Full Recommended Time

• Most resins require 2–5 minutes of mixing.  
• Stop only when the mixture turns clear and streak‑free.  
• If you see cloudy swirls, keep going.

5. Use Clean, Dry Tools Only

1. Water, alcohol, or dust can ruin the chemical reaction.  
2. Use fresh cups and stir sticks for each batch.

6. Double‑Cup Method for Accuracy

• After mixing in Cup #1, pour into Cup #2.  
• Mix again for 30–60 seconds.  
• This prevents unmixed resin from sticking to the walls of the first cup.

7. Watch the Working Time (Pot Life)

• Resin begins curing the moment Parts A + B touch.  
• Warmer rooms = shorter working time.  
• Larger batches heat up faster and cure quicker.

8. Avoid Introducing Moisture

• No water‑based paints or wet flowers unless sealed.  
• Moisture causes cloudiness or foaming.

9. Pop Bubbles After Pouring

• Use a heat gun, chef's torch, or grill lighter in sweeping motions. I prefer the chef's torch & lighter, as the heat gun can cause the resin to get too hot and cure too fast, or burn molds.
• Don’t hold heat in one spot — it can scorch resin or molds.
  
  

10. Don’t Rush the Cure

• Keep the piece covered and dust‑free.  
• Avoid touching for at least 12–24 hours (depending on brand).  
• Full cure often takes 48–72 hours.

11. Never Mix More Than Your Mold Can Handle

• Overfilling molds can cause overflow or overheating.  
• Large pours generate more heat — pour in layers if needed.

12. Safety First

• Wear nitrile gloves, eye protection, and ensure good ventilation.  
• Resin is safe when used correctly, but respect the chemistry.

Now that you've learned the rules of mixing resin, it's time to dive into how to mix the resin.

Free Printable Rules for Mixing Resin Guide