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Noticed small craters or ‘fish eyes’ marring your resin-coated wood? Understanding the reasons behind these surface flaws can help you achieve a flawless, glassy finish every time.
What Causes Craters on Wood When Applying Resin?
Craters typically arise when moisture or natural oils in the wood interfere with resin adhesion. When these contaminants are present, resin can pull back during curing, creating unsightly pits or depressions. Inadequate surface preparation—especially on absorbent or oily timber—makes this problem far more likely.
Preventing Craters: Surface Preparation Tips
- Sand Thoroughly: Begin by sanding the wood to open the grain and remove surface residue.
- Ensure Complete Dryness: Allow the timber to dry fully; even slight dampness may compromise results.
- Wipe Before Application: Use a high-purity product like Pure Isopropyl Alcohol to clean dust and grease from the wood just prior to coating.
- Seal Porous Wood: For highly absorbent or reclaimed timber, consider a penetrating primer such as EpoxyWood before your main resin pour.
Choosing a Resin for Wood Projects
Some resins are better suited for wood than others. Deep-penetrating formulas like EpoxyWood not only reinforce the timber but also help avoid cratering by bonding into the grain. For larger castings or tabletops, opt for a low-viscosity, bubble-resistant epoxy such as EpoxyTable 5-Five.
When This Matters Most
Eliminating craters is especially important for showpiece tables, functional surfaces, and decorative objects—anywhere you want a smooth, professional result.
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Proper preparation and the right resin choice can significantly reduce the risk of craters, giving your wood projects a flawless finish. For more tips on troubleshooting and perfecting resin applications, visit our main cratering FAQ.