I’m replacing my cheap vinyl bathroom floor with less cheap but much nicer-looking vinyl floor panels. I am worried though that spills might get between the planks and get into the subfloor since it doesn’t use any glue that might seal out water. Should I seal this bathroom floor before we put the new flooring down on the subfloor?

Edit: the subfloor is cheap mdf, it seems. So water damage would be exceptionally bad if it happened.

In addition, if the OSB isn't level to within 3/16" over 10', can I lay self leveling compound onto the OSB?

Or should I pull the OSB up and try to level the floor joists, and then lay the OSB back down...

Clearly I have a lot to learn and appreciate all the guidance I can get, thank you!

Wondering if anyone has any experience with the big box 'lifeproof' brand in semi-moist environments.

On our first floor we have a laundry room with a toilet in it. There is also a vanity that is terrible and will be removed with prejudice.

The wax seal on the toilet had failed shortly after we moved in and so I now have an excuse to do a partial renovation of the smallish room. Mostly just remove and replace the shitty vinyl tiles, kill the vanity with fire and replace it with a budget plastic utility sink.

As this is just a laundry room with bonus crapper, I was thinking of going cheap and someone suggested the 'lifeproof' option to me as it is cheap and potentially waterproof.

Asking the hivemind if 'lifeproof' planks are, indeed, an adequate option for a laundry room/bathroom. I don't anticipate a huge amount of water getting on the floor but the utility sink will certainly make some spillage more likely.

Doesn't have to be fancy or look good, just need it to not cause problems down the road.