Possible causes are:

  1. Low temperature. The epoxy will need more time to cure if your room temperature is lower than the recommended range. Applying heat to the project will help it finish curing.
  2. Off-ratio mixing. There may have been too much or too little hardener, which directly affects the cure time of the batch.
  3. Insufficient mixing. You may not have mixed long enough for the resin and hardener to be adequately mixed for a proper cure. Always mix thoroughly for a minimum of 3 minutes.
  4. Incorrect resin or hardener. Using UVPoxy resin or hardener with Liquid Plastic resin or hardener will cause under curing, overreacting, or other adverse effects to the batch.
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