10 Epoxy Resin Mistakes Beginners Make (and How to Avoid Them)
We've all thrown away a piece. We've all opened the lid after 24 hours hoping for a perfect surface and found something sticky, full of bubbles, or a yellower shade than expected.
That doesn't mean you're not good at resin. It means you don't know it well yet. The good news is that almost all problems that appear at the beginning have a very specific cause, and once you identify it, they disappear.
We've been teaching how to create with epoxy resin for years. And if there's one thing we've learned from the hundreds of students who have taken Green Maiden Art courses, it's that the initial mistakes are always the same. This guide exists so you can avoid them before you make them.
Mistake #1 — Not reading the manufacturer's instructions
It seems obvious, but it's the number one mistake. Each resin has its own proportions, its own working time, its ideal curing temperature, and its peculiarities. Assuming they all work the same is the first step towards disaster.
✓ How to avoid it: Before opening any container, read your resin's complete instructions. All of them. Once.
Mistake #2 — Eyeballing the proportions
Epoxy resin doesn't forgive inaccuracies. The chemical reaction depends on the exact proportion between resin and hardener. If there's more of one than the other, the reaction doesn't complete correctly. The result: a sticky, soft surface that doesn't fully cure.
✓ How to avoid it: Always use a digital precision scale to measure by weight. Never by visual estimation, never 'more or less', never by eye.
Mistake #3 — Mixing too fast or for too short a time
If you mix too fast, you introduce air into the resin, which results in thousands of micro-bubbles that are almost impossible to remove. If you mix for too short a time, unreacted areas remain, causing stains or uneven finishes.
✓ How to avoid it: Mix slowly and deliberately, scraping the sides and bottom for at least 2-3 minutes. Then transfer to a second clean cup and mix for one more minute.
Mistake #4 — Working at the wrong temperature
Most artistic resins need between 20 and 25°C (68 and 77°F). In cold conditions: the resin becomes thicker, bubbles don't rise, and curing may be incomplete. In too hot conditions: the process speeds up, you have less working time, and internal bubbles may appear.
✓ How to avoid it: Work in a temperature-controlled space. In winter, warm up the room before starting.
Mistake #5 — Not protecting the work from dust during curing
During curing, resin acts like a magnet for dust: any particle that falls on the surface gets trapped in it forever.
✓ How to avoid it: As soon as you finish torching for the last time, cover the piece with a clean cardboard box that doesn't touch the surface. Leave it like that throughout the curing process.
Mistake #6 — Not using protective equipment
Liquid epoxy resin can cause skin irritation and allergic sensitization with continuous exposure.
✓ How to avoid it: Use nitrile gloves (not latex) for every session. Work in a well-ventilated area or with a filter mask for organic vapors.
Mistake #7 — Using low-quality resin
Low-grade resins yellow quickly, have less transparency, and their behavior with pigments is unpredictable.
✓ How to avoid it: Choose a resin formulated for artistic use, with a guarantee of transparency and good resistance to UV yellowing.
Mistake #8 — Applying overly thick layers all at once
A very thick layer generates a more intense exothermic reaction, which can cause internal bubbles, ripples, or cracks.
✓ How to avoid it: Check your resin's maximum layer thickness and respect it. If you need greater depth, apply successive layers.
Mistake #9 — Ignoring working time
Working time (pot life) is the time from when you mix until the resin begins to gel. Trying to continue working the resin afterward forms strings and leaves the surface uneven.
✓ How to avoid it: Know your resin's working time before you start and work within that margin.
Mistake #10 — Wanting to do advanced techniques before mastering the basics
Resin is learned in layers, just like the works it creates. Attempting a 3D cliff technique without understanding how pigments flow is a recipe for frustration.
✓ How to avoid it: Start with simple pieces. Understand the material, then move on to more complex techniques.
Is your resin sticky? What could have gone wrong
Sticky resin: incorrect proportions, incomplete mixing, or too low a temperature.
Bubbly surface: mixing too fast or cold temperature preventing bubbles from rising to the surface.
Yellow tint: low resin quality or direct UV light exposure.
Ripples or marks: uneven temperatures during curing or air currents.
The mistake you shouldn't allow yourself to make: giving up after the first one
All artists who today create spectacular works with resin have experienced failed pieces. Error is part of the process. Epoxy resin has its own character, but when you dedicate the necessary time to understand it, it becomes the most expressive material you can work with.
If you want to learn how to use it well from the beginning, with a clear structure and the guidance of someone who has been perfecting each technique for years:
