Epoxy resin is a versatile material that finds applications in many areas - from jewellery and decoration to repairs and surface treatments. Although working with it can yield amazing results, there are a number of mistakes that beginners and more experienced users make. Let's take a look at the most common problems and how to avoid them.
1. Insufficient surface preparation
One of the most common mistakes is underestimating surface preparation. Epoxy resin needs a clean, dry and degreased surface to adhere properly. Always:
- Thoroughly clean the surface of dust and dirt.
- Degrease the surface with, for example, alcohol spray.
- Make sure the surface is completely dry.
If you are working with wood, consider using a primer to prevent air bubbles from forming in the porous material. You can also penetrate with a layer or several layers of resin.
2. Incorrect ingredient ratio
Epoxy resin consists of two components - resin and hardener. Failure to maintain the correct ratio can result in a mixture that never fully cures or has unsuitable properties.
- Always follow the manufacturer's specified ratio exactly.
- Use a scale that has not failed in the past and has new batteries. Only such a scale will weigh accurately. The scale must be accurate to within 1 gram (applies to casting at least 50 grams of mass).
- Do not mix "by eye" - even a small deviation can cause problems.
3. Insufficient mixing
Even if you follow the correct ratio, insufficient mixing of the ingredients will cause some parts to remain uncured.
- Stir thoroughly.
- Use clean mixing utensils.
- Make sure to mix even at the sides and bottom of the container.
- Avoid mixing too quickly, which introduces air bubbles.
- Stir for 3 minutes in one container, pour into the other and repeat stirring.
4. Ignoring ambient temperature
Epoxy resin is temperature sensitive. Working in an environment that is too cold or too hot can cause problems.
- The ideal temperature for working is usually 20-25°C
- At lower temperatures, the resin flows less easily and takes longer to cure; it may not cure at all.
- At higher temperatures, it may cure too quickly and cause an undesirable exothermic reaction.
- The temperature must be stable throughout the formation and curing process.
5. Air bubbles
Air bubbles are a common problem that can ruin the appearance of the final product.
- After mixing, let the mixture sit for 5-10 minutes to allow the bubbles to rise. However, pay attention to the height at which the resin is in the mixing vessel (see recommended casting height for each resin). The resin must not start to warm or get hot.
- Use a hot air gun or gas torch to remove bubbles on the surface, just swipe quickly to avoid scorching the resin to the mold or causing an exothermic reaction.
- Consider using a vacuum chamber (vacuum pump) for more challenging projects.
6. Impatience in curing
Epoxy resin needs time to cure. Handling the product before it is fully cured may cause deformations or impressions.
- Respect the curing time specified by the manufacturer.
- Count on the fact that full curing may take several days.
- Protect the curing resin from dust and dirt.
7. Poor storage of material
Improper storage can shorten the life of the resin or alter its properties.
- Store in tightly closed containers.
- Store out of sunlight.
- Adhere to the recommended storage temperature.
- Respect the expiry date.
Working with epoxy resin can be very satisfying if you avoid the above mistakes. Careful preparation, strict adherence to the manufacturer's instructions and patience are the keys to success. With each project, you will gain more experience and your results will get better and better. Remember that even experienced craftsmen are still learning new techniques and tricks to achieve perfect results.
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