If you're new to working with epoxy resin, you're definitely not alone!

This versatile material offers endless creative possibilities – from jewellery and artwork to home décor. However, beginners often encounter typical problems such as air bubbles in the resin, sticky surfaces, or unexpected results.

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The good news: with the right knowledge, these mistakes are easy to avoid.

In this article, you'll discover the 5 most common epoxy resin mistakes and get practical tips on how to prevent them step by step. This will help you save time, money, and frustration – while allowing you to fully enjoy pouring, designing, and creating.

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By the end, you'll feel more confident working with epoxy resin and be ready to complete your own projects without the classic beginner mistakes.

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1. Not Measuring Resin and Hardener Accurately

One of the most common beginner mistakes is estimating instead of measuring the resin and hardener precisely.

Epoxy resin is a two-component system — only the correct mixing ratio ensures complete curing and a strong, non-sticky finish.

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What happens if the ratio is incorrect?

If too much or too little hardener is used, the surface may remain sticky or soft, the resin may not cure completely, and its mechanical properties can be reduced.

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How to avoid this mistake:

• Always measure by weight (Art & Craft by volume). Use a digital precision scale with a TARE function.

• Work with clean, separate mixing cups: first weigh the resin, set the scale to TARE, and then add the hardener.

• Product-specific mixing ratios (Artline Epoxy Resin):

- Super Gloss, Deep Casting, Artwork & Topcoat, Floor Coating Primer: 2 : 1 (2 parts resin : 1 part hardener) — by weight.

- Casting, Deep Pour, Floor Coating Roller Layer: 3 : 1 (3 parts resin : 1 part hardener) — by weight.

- Ocean Wave: 1 : 1 — by weight.

- Art & Craft, Fluid Art: 1 : 1 — by volume.

• Always double-check your measurements before you start mixing.

• Then mix thoroughly, but slowly and evenly — don't forget the bottom and sides of the cup.

Always measure precisely – never guess!

Even small deviations in the mixing ratio can prevent epoxy resin from curing properly or cause it to remain sticky. Therefore, take enough time and work accurately.

Tip: use a digital scale with a TARE function for perfect results.

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2. Mixing Too Quickly or Not Thoroughly Enough

Another common beginner mistake when working with epoxy resin is mixing the resin and hardener incorrectly.

Usually, two things go wrong:

• Stirring too quickly

• Not mixing long enough

What goes wrong?

• Stirring too quickly: This creates many small air bubbles that may remain visible in the finished result.

• Insufficient mixing: The resin and hardener do not combine completely, which can lead to sticky areas or sections that never cure properly.

How to avoid this mistake:

• Stir slowly and evenly for 3–5 minutes.

• Make sure to thoroughly scrape the sides and bottom of the mixing cup.

• The mixture should be completely uniform and free of streaks before use.

• If in doubt, use the double-cup method. Pour the mixture into a second clean cup and mix again.

Pro tip: Use a wooden or silicone spatula for mixing. Tools that are too small often do not mix the material thoroughly enough.

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3. Pouring Epoxy in Layers That Are Too Thick

Many beginners want to finish their project quickly and therefore pour a thick layer of epoxy resin all at once. This may seem convenient, but it is one of the biggest mistakes when working with epoxy.

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What goes wrong?

• Overheating: Epoxy generates heat during curing. A layer that is too thick can become extremely hot.

• Deformation & cracking: Overheated resin can warp, crack, or even damage the mould.

• Yellowing: Excessive heat can cause the resin to turn permanently yellow.

How to avoid this mistake:

• Work layer by layer: It is better to pour several thinner layers rather than one thick layer. For standard applications using Casting Resin, a maximum layer thickness of up to 2 cm is recommended.

• Allow layers to cure between pours: Each layer should cure fully before the next pour to prevent overheating and internal stress in the material.

• Pay attention to the pouring depth: Different epoxy resins are designed for different pouring depths, for example:

Casting Resin → up to 2 cm per layer

Deep Casting Resin → up to 5 cm per layer

Deep Pour Resin → up to 12 cm in a single pour

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By choosing the right resin and following the recommended layer thicknesses, your project will remain clear, stable, and free from yellowing.

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Conclusion:

By following these guidelines, your epoxy resin will remain clear, bubble-free, and stable without heat damage or discolouration.

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Pro tip:

Work in a well-ventilated area and monitor the temperature. An infrared thermometer is ideal for keeping track of the heat generated during curing.

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4. Working in the Wrong Environment

The environmental conditions have a major influence on the outcome of your epoxy project. Many beginners underestimate the importance of temperature, humidity, and cleanliness.

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What goes wrong?

• Room too cold: The resin cures much more slowly and may remain soft or sticky for longer.

• High humidity: This can cause cloudy areas or permanently sticky surfaces.

• Dust & pet hair: Small particles can settle on the surface during curing and ruin the finish.

How to avoid this mistake:

• Clean working environment: Work in a dust-free area without draughts. Carefully cover your project while it cures using a suitable cover (e.g. a cardboard box).

• Optimal temperature: Keep the room temperature at 22–25 °C.

• Keep humidity low: Ideally, humidity should be below 60%.

• Warm up cold rooms: If the room is too cold, you can warm it before pouring using a fan heater or infrared heater.

A thermo-hygrometer helps you accurately monitor temperature and humidity — a useful tool for every resin workshop.

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5. Not Sealing Porous Surfaces Before Pouring

One of the most commonly overlooked mistakes in epoxy projects is skipping a sealing layer, especially when working with wood, MDF, or other porous materials.

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What goes wrong?

• Air bubbles: Open pores release air into the resin during curing.

• Uneven absorption: Porous materials absorb resin unevenly, which can cause stains or a dull finish.

• Loss of clarity: Instead of a crystal-clear surface, the final result may appear cloudy.

How to avoid this mistake:

• Always treat porous surfaces first with a thin sealing layer.

• This closes the pores and helps prevent air bubbles.

• For this purpose, we recommend using Crystal Clear Casting Epoxy Resin due to its low viscosity and strong adhesion.

Especially for projects using Deep Casting or Deep Pour Epoxy (such as river tables), sealing the surface beforehand is essential for a perfectly smooth and bubble-free result.

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Conclusion: Avoiding Common Beginner Mistakes with Epoxy Resin

Everyone makes mistakes when learning something new — and epoxy resin is no exception. Fortunately, most problems can easily be avoided with a little preparation and knowledge.

The most important points at a glance:

• Always measure resin and hardener precisely.

• Mix slowly and thoroughly.

• Pour in thin layers to prevent overheating.

• Work in a clean and stable environment.

• Seal porous surfaces beforehand.

By following these steps, you can avoid most common beginner mistakes and achieve consistently clear, stable, and glossy results.

Whether you're making jewellery, river tables, coasters, or artwork, the key to success is patience, precision, and practice.

In our epoxy shop, you'll find everything you need — from Casting Epoxy Resin for thinner layers to Deep Casting and Deep Pour Epoxy for larger pouring projects, along with useful accessories for perfect results.

Enjoy your resin art — and may your next project turn out smooth, glossy, and flawless!

Feel free to share your creations with us on social media and tag us — we look forward to seeing your ideas!