How Resins Behave Over Time

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How Resins Behave Over Time

How Resins Behave Over Time

By: April Greenlaw

Have you ever wondered how epoxy behaviors over time when exposed to direct sunlight? Is there a way to protect the epoxy from the sun? In this week's blog we will be going over what can happen to epoxy over time. What happens to epoxies that are exposed to sunlight for long periods of time, and how to protect the epoxy from UV lights.

First let's talk about what happens to epoxy that is exposed to direct sunlight. If epoxy is exposed to direct sunlight for long periods of time, it will yellow over time. All epoxies it doesn't matter the brand will yellow over time in direct sunlight. So you may ask yourself the big questions why? The primary cause for epoxy coatings turning a yellow color is exposure to U.V. light. Also known as ambering. When exposed to direct sunlight or strong indirect sunlight over a period of time, epoxy will experience a photochemical reaction known as polymer degradation. Polymer degradation is a change in the properties of the polymer, such as color, strength, shape, and molecular weight. Or of a polymer-based product under the influence of one or more environmental factors, Such as heat, light, chemicals, or any other applied force.

Second thing to know about yellowing epoxy is it can be caused from a mixing issue. If you do not mix Pat A well enough with Part B the Part B will rise to the top. This will cause the yellowing as well. This type of yellowing is rare, but can still happen. Mostly the exposure to the sunlight or UV light is the main cause of yellowing.

Here are some ways to prevent yellowing from happening over time. You'll want to make sure your project is not in direct sunlight. If you're worried your house is too sunny inside you could use some curtains  to block out the sunlight. If you are using this for an outside project you will want to make sure you use a cover for anything like a jacuzzi tub, hot tub, pool, or even flooring. This will prevent yellowing while not in use. I would also recommend a shady place like under a tree for a good place for a project. Lastly you can always apply a high performance clear coat such as polyurethane, polyurea, or a polyaspartic. These types of clear coats are U.V. stable. They will not amber when exposed to direct sunlight. Epoxies can be sensitive, they are a science, take necessary precautions and your project will last for a very long time!


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