I've done ALL the prescribed fixes on my 22mm tank and can fill it all the way up, so that when I put the cap back on and twist it closed I get a bit of juice squished out from beneath the threads and still all is OK with no leaks, seeps or drips. This all depends on exactly what condition the tank was in when you got it, varying QC allows some lucky folks to NOT have to do anything to theirs, as in NO Fixes at All, and others of us not so lucky. I have only used KGD in mine so far, and with a 3.5mm coil.