I am trying to Reverse Engrave a piece of cast acrylic (from Trotec Materials) and attempting to paint through the clear to get a multi colored image. An issue that I am having is that over time (still determining the time frame) the paint will go from bright and clear and robust to very faded and greyed. I am not sure if this is due to the paint or the engrave. I have tried a variety of material settings and different paints and seem to run into this issue a great deal of the time and I cannot pinpoint the cause.
Here are a couple images pretty close to right after painting where a lot of the paint looks good. It is starting to happen on the royal blue in “Rock and Amy” and also the small royal blue panel of the beach ball (it is the same paint).
If anyone has any advice or has had a similar experience I would love to hear.