What bible version did you get that out of. There is no word purgatory in that verse.
1 peter 3: 18 -1
18 For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but quickened by the Spirit:
19 By which also he went and preached unto the spirits in prison;
18 For Christ also hath once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but quickened by the Spirit:
19 By which also he went and preached unto the spirits in prison;
20 Which sometime were disobedient, when once the longsuffering of God waited in the days of Noah, while the ark was a preparing, wherein few, that is, eight souls were saved by water.
Seem to me Jesus preach to the disobedent oN the day of Noah
Purgatory catholic version is fire for catholic soul that still have unconfest sin during their life.
So that verse is not about purgatory.