The latest 1.6.4 build, number 1037, includes what are hopefully the final changes on Oxygen Sealers. Sealers should be working perfectly now and with no lag. There are two new config settings, I recommend use the default settings for those. If you have torches in your space base, they will light up and go out as the "sealed" status changes - this can be a nice way to know whether your sealers are working well or not. Please can players give feedback on whether there are any issues at all with the Oxygen Sealers and sealed bases in build 1037. I would especially like to hear if there are still any issues with airlocks (posts #69, #70 and #71 in this thread) or on Mars (post #74) - and please do report to us if you a message in the logs saying "*** Please report to mod author: BlockPassAirCheck block ID # was null ***".