From my experience you can pretty much rotocast most resins if you work several small batches. I've slush cast Smooth on 300 and onyx several times will good results. Check out a lot of helmet casting videos to see what I'm talking about.
Also, a lot of people avoid 65d due to it getting deformed easily in mild heat situations like direct sunlight or in hot trucks during transit through the mail.
Also, a lot of people avoid 65d due to it getting deformed easily in mild heat situations like direct sunlight or in hot trucks during transit through the mail.