I have some thing like that called Spectra-lite and I have it in 4 colors, red , blue, silver and gold. I tried two sets of pen blanks and the stuff not only peeled off the pen tubes but my resin was cloudy and turned white. I don't have a clue as to how or why they peeled off the pen tubes. Yours turned out very nice. I found it very discouraging after having only one set of pen blanks turn out nice and clear. Great job on your pen. I had mine in the pressure pot for about an hour. Fay