I still have some CC plastic in various boxes in my garage (though only regular formula)... and as long as you plan on it being cloudy from the get-go, I think it's fine for all colors (even going as light as mo's milk), but glitter definitely gets obscured. I've not had the scorching issues DF mentions, but it might be because I heat shorter/slower burst and let it rest as it gets closer to injecting temps (which I do to allow the bubbles to dissipate).