Here were some common reasons:

1. • Trapping Air During Mixing: Stirring the resin and hardener too vigorously can introduce air into the mixture, resulting in unwanted bubbles.
   • Humidity and Temperature Issues: Excess humidity or improper temperature settings can encourage bubble formation during the curing process.
   • Pouring on Porous or Uneven Surfaces: When applied to materials like wood or fabric, trapped air from the surface may rise into the resin, creating bubbles.
   • Incorrect Mixing Ratios: An improper balance of resin and hardener can cause curing problems, often leading to the appearance of bubbles.

Tips to Prevent Bubbles in Epoxy Resin:

• Mix Slowly and Steadily: Stir the resin and hardener gently to prevent air bubbles from forming. Avoid rapid stirring, as it can introduce unnecessary air into the mixture.

• Ensure Complete Mixing: Mix the resin and hardener thoroughly until fully combined. Incomplete mixing can lead to improper curing and bubble formation.

• Maintain Optimal Room Temperature: Work in a room with consistent temperatures between 70-75°F (21-24°C) for the best curing conditions.

• Control Humidity: Keep humidity levels low by using a dehumidifier if needed. High humidity can negatively affect the curing process and increase the chance of bubbles.

• Properly Prepare the Surface: Clean the surface thoroughly to remove dust and debris, as these can introduce bubbles into the resin.

• Seal Porous Surfaces: For porous materials, apply a sealant or a thin layer of resin before your final pour. This prevents air from escaping into the resin during the curing process.

• Use a Heat Source: After pouring the resin, gently pass a heat gun or small torch over the surface to release trapped air bubbles. This step is key for a smooth finish.

• Handle Heat Carefully: Keep the heat source moving constantly to avoid overheating the resin, which can cause issues such as yellowing or scorching.