Does anyone know off hand if the composition of Pro Plastic has ever changed through the years? I've purchased used Pro discs before and they have a sheen and smoother feel than new Pro discs. Is that a result of aging and wear? Specifically, I bough a used Pro Starfire that had become a beautiful and dependable understable machine. I lost it to the lake at Old Settlers in Austin, TX. Now, new Pro Starfires seem considerably more grippy and obviously more stable. This brings me to my next question. Does anyone have any successful suggestions about pushing discs to become understable faster than normal wear and tear does? In accordance with PDGA, is such artificial "beating in" of discs considered at all unethical?