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Yellowing
Dec 22, 2020 15:26:15 GMT -5
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Post by Resinista on Dec 22, 2020 15:26:15 GMT -5
A few months ago I purchased a gallon of ACC, and I’ve used twice since then. I just pulled it out again and to my horror the Part B bottle and contents have yellowed significantly. Is this normal and will the discoloration affect the clarity of the final product?
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Post by notoes on Dec 23, 2020 7:35:22 GMT -5
Short answer - yes it sometimes does this.
And here's the long answer:
"As with all epoxy chemistry, ACC will develop a yellow hue over time. While there are UV inhibitors in our system that help it resist longer than some competitor products, a yellow hue will still develop over time. Many times this is not ever noticed based on the underlying surface color and the relative thin layer. Applications where ACC is applied over bright white surfaces or when pouring thicker layers, yellowing may be more evident. We generally do not recommend ACC for outdoor applications, as the UV exposure will cause the resin to develop a yellow hue rather quickly. There are some instances where it may be reasonable such as adding Alumilite dye or Alumidust to color the resin, which often negates or minimizes the yellowing. Also applying it over certain toned wood surfaces that have more yellow and orange hues to it would make the yellowing less noticeable."
Now there is a case in point that I would like to make, I have a gallon set of Amazing Clear Cast Plus that I have kept in a room that gets indirect sunlight, it only gets direct sun as the sun comes up and only then if I have the blinds open, and I have not covered them in any way. Neither side has changed color at all. On top of that I made a sun-catcher with it and purposely put it on the other side of the blinds so that it would get all the sunlight it possibly could to test the UV resistance and it hasn't yellowed in the slightest either.
Now you may have the regular Amazing Clear Cast and I am using the Plus one and that may be the whole difference between them but I have also used the regular to seal mold box bottoms and have yet to see one that yellowed. So my advice - go ahead and use it to see if the yellow is still there and if so, try to incorporate the yellow into the design so that it isn't as noticeable.
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