I'm not saying that you are mistaken, but I have to say that I hope you are since I have already sealed mine.
if you feel you made the wrong choice, just wait til it dries and sand it off, no harm no foul
i have no clue what the "right" way is to handle this, im only speaking from my personal experiences thus far with multiples of the chosera series(both baseless and w/ base) all of my baseless stones that i never sealed have had some form of cracking issues, 3k/5k/8k snow white.
i was HEAVY into honing straight razors for a few years, 15+ razors a week(almost every razor with no existing bevel) these stones saw a TON of wet/dry cycles chosera 3k/5k/8k snow white, all cracked.
a very close friend of mine who restores+hones razors professionally for a living, 75+ razors a week minimum, every week for multiple years now, bought an 8k snow white on my recommendation(before i had cracking issues). when the cracking got bad enough to where it was unusable on his first one, since he loved it so much and thought it might have been a fluke, he bought a second one and experienced the exact same thing. both of his snow whites were never sealed. he switched back to the 8k naniwa super stone series for his progressions.
here is an album of my experience so far w/ the chosera series:
the 400 is sealed w/ minwax polycrylic and has no issues, the 3k is harder to see the spiderwebbing so i splashed a bit of water on it so it shows up. the 5k is the worst of the bunch which is funny because it was also the most expensive and by far and away my least favorite of the series.