The primary buckets I made have a rubber o-ring in the lid and they always seal great - so great in fact that I have to be careful of suckback if the beer cools a little before fermentation starts. Last month I purchased a 6 gallon Romak primary bucket from the LHBS, the lid snaps on nice and tight but it has no o-ring, and the airlock won't bubble even at high krausen. Just shows a little positive pressure, but most of the CO2 escapes around the lid. It's no big deal, I can smell that it's working.
Wait at least 10 days and then check the gravity, I'm sure it's fine.
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"If you're gonna be an ape, be a hairy one" - Spyder
Primary 2: Edwort's Robust Porter
Secondary 1: LW Pale Ale
Secondary 1: Blackened Soul RIS
Kegged: Dead Guy Ale
Kegged: Rye Pale Ale
Kegged: Haus Pale Ale
Kegged: Nut Brown Ale
Kegged: Afrikan Amber
Kegged: Jock Scott Ale
Kegged: Afrikan Amber
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