I use fermcap-S but lately I've been first Wort Hopping so I haven't needed it at all, with the hops (whole hops in my case) in the wort before boil I don't have any sign of boilovers.
"People should not be afraid of their governments. Governments should be afraid of their people." - V
Secondary: Shady Lord RIS, Water to Barleywine, Pumpkin wine, burnt mead
Kegged: Crappy infected mild
Bottles: Apfelwein, 999 Barleywine, Oatmeal Stout, Robust Porter, Robust smoked porter, Simcoe Smash