After visiting many micro-brewery operations and drooling over all the stainless and copper, I return home to my plastic buckets and secondary fementer "brewery" tucked away in an unused bathroom. Like other home "plastic bucket brewers", I have struggled with leaky lids. I thought back to loosing $2,000 cameras while doing marine research due to leaks in the seals and how we fixed the problem - Vaseline. I have been using a bit of Vaseline around the very top and duct taping those lids down and this has eliminated the leaking problem. Hope this might help those fighting plastic bucket CO2 gas leaks.