Originally Posted by beerspitnight
open ferment and avoid all of those issues
I always start my fermentations with a blowoff tube in place. Ironically, doing this often prevents the fermentation from blowing off because it allows a larger volume of CO2 to off gas faster then an airlock would. Most of my fermentations end up blowing off any way.
The down side to allowing the blow off to happen is that you're losing some of you most active yeast cells right away when you need them most. No, it's not a huge percentage, but it's something to think about. I've never used a product like fermcap, but lots of people do (including many breweries) and it definitely allows you to ferment with less head space and avoid losing all that yeast.