Fully cured epoxy resin is completely waterproof, it's true. However, if moisture gets mixed in while epoxy resin is still in its liquid state, it can interfere with the curing process and cause several issues:
- Cloudy Appearance: Moisture can cause the resin to develop cloudy, white, or hazy areas, impacting the clarity and visual quality.
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Amine Blush: Moisture causes amines in the hardener to rise to the surface and form a waxy or greasy film on the cured resin.
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Surface Imperfections: Moisture can result in ripples, waves, divots and a pock marked surface.
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Incomplete or Slow Curing: Moisture can hinder the chemical reaction between the resin and hardener, leading to a tacky or soft surface that won't fully harden.
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Weakened Bond: Moisture in the substrate can compromise the bond with the resin, preventing adhesion or leading to potential delamination.
- Bubbles: Trapped moisture can create bubbles or foam within the resin during the curing process.
https://www.artresin.com/blogs/artresin/how-does-moisture-affect-epoxy-resin
