A warm water bath is useful if your resin is colder than room temperature, for example, during the winter months. Cold epoxy resin is thick, difficult to spread, and is full of microbubbles, whereas warmer resin is generally easier to work with and has far less bubbles.
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https://www.artresin.com/blogs/artresin/how-do-you-give-resin-warm-water-bath
