Preventing fish eyes in coasters

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    • #11806
      Katherine Swift
      Keymaster

      This question comes from Janus:

      In my project, I use exotic wood to make coasters. The coasters are laser engraved, a process which releases and scorches the natural wood oil.

      I sand down all the burn marks leaving a smooth surface. The engravings are filled with colored resin, it works well. The rest of the surface is sealed with a lacquer based sanding sealer and smoothed down again.

      The next step is to seal the whole lot with a clear resin coat. And this is where I struggle as there are plenty of fish eyes. Should I rather skip the sanding sealer and leave the wood rough, or will the wood oil also re-act with the resin?

    • #11807
      Katherine Swift
      Keymaster

      Hi Janus,

      It sounds like you may be using a resin that doesn’t have enough surface tension to want to stay even on the surface. I would suggest using a thicker mixing (doming) resin. If you are already doing that and getting fish eyes, you may need to create a tape dam around your coasters. Pour the resin, then remove the tape after casting.

      I would avoid not sanding as I am concerned the oil would act as a mold release.

      Good luck!

    • #86737
      Katherine Swift
      Keymaster

      This article explains how fish eyes happen and what you can do to fix them: https://www.resinobsession.com/resin-art/why-are-there-dents-and-holes-in-my-resin-painting/

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