Surface Texture and Fisheyes
Have you ever encountered pouring your heart into a resin project only to find odd surface textures or pesky fisheyes (those annoying little craters or divots) on your finished piece? You're not alone! Not only do these imperfections affect the appearance of your project, but they can also weaken the bond or durability of the finish.
Don’t worry, we’ve got you covered! Let’s walk through what causes these issues, how to avoid them, and how to fix them if they do pop up.
What Causes Surface Texture and Fisheyes?
In most cases, these problems come down to three main things:
- Using the wrong type of resin
- Issues during mixing and pouring
- Unfavorable working conditions (temperature and humidity)
If you keep these factors in check, you’ll be well on your way to a smooth, flawless finish.
Common Mistakes and How to Avoid Them
1. Using the Right Type of Resin
Not all resins are created equal! Using low-viscosity (runny) resin - like deep pour or standard casting resin on large, flat surfaces can easily lead to fisheyes and surface depressions.
Tip: For coating projects like river table seal layers or tumbler finishes, choose a high-viscosity coating resin. It's designed to level smoothly and hold its form on flat surfaces.
2. Mixing and Pouring Properly
Even the best resin won’t work well if it’s not mixed and poured with care.
- Thorough mixing is a must: If the resin and hardener aren’t fully blended, it can result in uneven curing. Be sure to scrape the sides and bottom of your mixing cup, and stir slowly and steadily until the mixture is totally uniform.
- Watch the heat: While a heat gun or torch helps eliminate bubbles, too much heat in one spot can scorch the surface or create ripples. Keep the heat moving and use it sparingly.
3. Pay Attention to Your Environment
Resin is sensitive to the space you’re working in - especially temperature and humidity.
- Too cold? Resin will flow slowly and may leave streaks or drag marks.
- Too humid? Moisture can get trapped in the surface, leading to texture problems or sticky spots.
- Ideal conditions:
- Temperature: 73–78°F (23–26°C)
- Humidity: Below 60% RH (ideally 50–55%)
4. Clean Your Surface Before You Pour
Even tiny particles of dust or oil can interfere with how your resin sets.
Best practice: Always wipe down your mold or project surface with isopropyl alcohol before pouring. A clean surface means fewer surprises later!
5. Protect While Curing
Your project might look great when you walk away, but dust, hair, or moisture can sneak in while it cures.
Cover it up: Place a clean box or container over your project while it cures to keep out debris and moisture in the air.
How to Fix It If Things Go Wrong
- Lightly sand the surface using fine-grit sandpaper.
- Clean off all the dust - don’t skip this step!
- Apply a fresh layer of coating resin to smooth everything out.
Pro tip: Always do a small test before working on your final piece, especially if you're using a new brand or working in different conditions.
With the right tools, a bit of prep, and some extra attention to detail, you can prevent most of these common resin issues and fix them when they happen. Resin work is as much about patience as it is creativity, so don’t get discouraged. Keep practicing and pouring! Happy crafting!