I frequently just use a cloth cover for my primary. You want to keep bugs
and dust out but it is good for it to breath. The main thing about not
bubbling over is don't fill it too full. Usually 1/2 to 3/4 full is fine
during primary.

Ray

"Juwanna" > wrote in message
news
> Just a wee question on lid seals for the primary fermentation process.
Does
> the lid need to fit tight or can it just simply be resting on top loosely.
> The reason I am asking is I have had a few batches bubble over during the
> primary fermentation process and was wondering if this affected the
alcohol
> content or anything else. I usually just leave the plastic lid loosely
> placed on top of the bucket to keep whatever out....
>
>