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I made a large batch and found a few areas that are still sticky after most of the surface is cured hard. What happened?

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I made a large batch and found a few areas that are still sticky after most of the surface is cured hard. What happened?

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The material was probably not thoroughly mixed and unmixed material was scraped from the container onto the surface. When mixing always be sure to mix from the bottom to the top and scrape the sides of the container and the stick. Experienced users dump and scrape the mixed material from the first container into a second and then mix again. This totally avoids the problem described above.

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