I use Envirotex for mine. Only once did I have a problem with fish eye-contamination due to silicone grease, (my fault, don't ask!)
I was nervous using Envirotex, at first-due to all the cautionary tales I'd read. As it turns out, I haven't had any special problems with it, just the normal learning curve. The thing that makes most difference to me is too cold environmental temp. I don't use gloves. I bought disposable brushes, but I cut one at the perfect angle and don't want to chuck it, so I just clean it with acetone, then soap and water-no problems there either. Disposable mixing cups are a must, found that out the hard way!