Thanks for the input everyone, have read all with interest. Don't mean to get sensitive about anything, with me it is often the case of not what was said, but how it was said. We are all adults here, I treat people accordingly and only expect the same in return. Anyways, it was not even you LGM that I was addressing.
This for me has been an ongoing problem for years, but as I said earlier, sometimes they have come out fine doing nothing, so was never really motivated to find a solution. My interest in doing these very recently started again as I see a market for these, and all of a sudden old problems were back at my feet so I look for a solution.
As stated, more testing is needed to find a repeatable solution. My 1st test was to simply clean the surface, and that one came out perfect, not a single wrinkle.
2nd one with the same cleaning turned out near perfect, but with just enough flaws to make it scrap ... Really, with these as with many other CNC projects intended for sale, no flaw is acceptable, especially one that is so visually obnoxious as wrinkling. Most other mediums can be worked on and "fixed" after a cut, usually by sanding. But with these you are locked, if it wrinkles there is nothing feasible that you can do to fix it, it is ruined.
So it was stated that perhaps I did not allow enough cure time - Maybe, maybe not. I think I will try a test on some semi scrap [these are various plexi pieces I have that still have the protective paper on them, but will likely never be used due to their size].
One I will paint without cleaning, one I will paint after cleaning. Will let cure 3 days then scratch a couple X's in them to simulate an etch, then coat with clear and see what happens. If the cure theory is correct then they both should be fine. If the contaminant theory is correct then the cleaned one should be fine, the uncleaned trashed.
Would also like to do the same test but with only a 2 hour cure - With the other test, that should expose if both cure & contamination are factors, will update when able. But as also stated, there could be other factors at play, atmospherics, temperature and humidity to name a few. I am hoping is it not that complex, and I will not have to build a regulated chamber to produce perfect results every time !
Thanks again for comments and suggestions, I hope reading this inspires others to experiment and make their own. When they come out right they are very elegant and unique.
Last edited by Xxray
on Wed Sep 02, 2015 5:54 pm, edited 1 time in total.