Sometimes, you will see epoxy products that are labeled as “casting resin”. If this seems confusing, you should know that these are just two different types of the same thing. Casting resins are special-purpose epoxies that are meant for easier pouring and casting.
The main difference between these two types of products will mainly come from their viscosity. Casting resins are a lot thinner, which is good when you are doing a deep pour. This also leads to a longer curing time, but that is what you want for filling those large cavities. This slower curing time gives air bubbles more time to rise to the surface, leading to a crystal-clear result.
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