I added 7 drops of Anti-foam to my last batch right at boil start and it completely stopped a boil over. I also thought that this would stop any blowoff or at the least keep it in control. I have never had so much blowoff. the beer is a pale ale with 1056 which I have had great results with before. I usually only have maybe a cup worth of blow off foam. With this batch I had constant blow off for 3 days.