Making coasters heat proof

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    • #13015
      Di Lawson
      Guest

      Hi, please help…Im pretty new to resin and have been using water clear polyester and trying to make coasters, but even after curing for at least a month, when I put a cup of tea on them the mug leaves a mark and spoils the look of them. I’m stick of sanding them down. I’ve tried a gloss acrylic varnish and even engine lacquer, but still the marks…..I did read on a forum about something “bondi” glue or something similar……….any suggestions very welcome.
      Thanks
      Di

    • #13022
      Katherine Swift
      Keymaster

      Hi Di,

      It’s been my experience that a hot mug straight from the microwave or with extremely hot liquid leaves marks on coasters. Polyester does cure quite hard, however, and I would haven’t expected as many problems with that kind of resin. Are you sure it’s fully curing?

      • #13038
        Di Lawson
        Guest

        Hi Katherine
        Thanks for your reply and love you’re creations!
        Yes I think they’re curing, I’ve been leaving them about a week before sanding, but then I’m getting finger marks on where my fingers have been. Also, what would I pack my pieces in to take them anywhere, as when I’ve tried, I wrapped them in a towel and the towel left imprints on the resin. I also tried bubble wrap which did the same. I know it sounds like they’re not curing…..?????

        • #13041
          Katherine Swift
          Keymaster

          Are you leaving fingerprints and lint on the surface exposed to air during curing or on a different surface?

          • #13048
            Di Lawson
            Guest

            On all the surfaces. They aren’t sticky as such, except the exposed part, just if I’m handling them too long, when sanding the bottoms.
            What do you use to wrap them in when you send them out, please?
            Thanks
            Di

    • #13062
      Di Lawson
      Guest

      Thanks a lot for all your suggestions. I’ve not heard of glassine paper and will check it out, along with the link.
      All the best
      Di

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