Thanks to you both for your help. The reason I'm really concerned about this is the fact that this garage has had a history of peeling paint off the ceiling. My mom lived in this house, and I spent many hours trying to scrape and get rid of big peeling pieces of paint off of the ceiling in this unheated garage. I would get it looking pretty good, but before you knew it, more was peeling off. Ughhh!! I always thought the reason was that someone had painted with an interior paint not suitable for extreme temperatures. The garage did get very cold despite the fact that it was attached to the house. I don't think it was insulated (it is now, however). So.....my husband used a sander and got off all of the remaining old paint, and now we have a new coat of drywall over it. Stains are already showing through it, and the drywallers said it was from sap from the the pine boards up in the attic. Although I don't understand that because those boards are so old.....hard to imagine they're still seeping sap. Last night we were in a big box store (Menards in Indiana), and we got a sales person who actually was pretty good. He confirmed what you've said, and he recommended the Cover Stain also. He said it's much easier to work with (and cheaper) than the shellac-based BIN. That sounded good! After all, we don't need to cover up odors or smoke or anything like that.....just the stains. Thank you so much....without your help I'm sure we would just have bought the KILZ because that is the brand we are familiar with.

Tmnca, yes, you can buy tsp in CA. I know about the substitute tsp products that you have mentioned, but you actually can buy real tsp in CA. There are boxes of real tsp on the shelf at my local hardware store. They have the substitute too. Real tsp is evidently also available for pickup at the Lowes and Home Depot stores that are closest to me (according to their websites), though I've had trouble finding the real tsp at the big box stores in the past. If, for some reason, you can't find it at a store near you, you can just order it online and have it shipped to you. Edited to add, I actually went through a period of time where, like you, I thought you couldn't buy it in CA. I don't know the exact laws and whether or not it is actually not legal, but...it's definitely for sale here, one way or the other. I think it may just not be legal to sell dishwasher/washing machine/other detergents with it added?

This site may answer you question about using the KILZ with adhesive type flooring. Also, here is site on how best to clean the floor. I would suggest first cleaning the floor and then treating with the enzyme to see if that eliminates the problem. If the concrete was initially sealed, it's possible the odor may be concentrated in the flooring and wood trim, which would mean you wouldn't have to take the last step of applying sealant. After cleaning, if the odor still remains, you may have to treat with a sealant like KILZ and then use a floating plank flooring, or a flooring that can be glued directly to the sealed concrete. You'd have to be sure any adhesive used will work on a sealed floor.

There is a problem that has been going on for at least 10 years with some paints that don't cure properly and stink forever. We repainted our guest bathroom in 2013. The paint dried but stunk like chemicals. We waited a whole year and the smell did not go away. I found some very extensive forum links from people who had the same problem. The problem seemed to be across paint brands. Just did a search on it and found this forum with posts from 2019/2020 so it is still going on. https://www.bobvila.com/posts/89017-lingering-paint-fumes The fix that most resulted to on the forum I was following in 2013 was to replace the drywall. Which is what we eventually ended up doing in 2015. Tore the whole bathroom out (tile also due to there being drywall above the tile line) and replaced every painted surface with new drywall. Smell gone! Many people tried encapsulating the smell with various products, baking it out, ozone machines etc. We tried baking and ozone with no luck. From the many posters it seemed only drywall tear out and replacement worked so that is what we did. I was very nervous to paint the new drywall and every paint brand you could think of was on the thread as having caused problems. Zero VOC and low VOC paints seemed to be the common thread of people that had problems and it was across all brands. I suspected improper mixing of chemicals from China that were common to all paints. As a result I chose a paint made in the USA called ECOS paint. I spoke to them on the phone and they said they did all their own manufacturing and had not had the problem with the odor that doesn't go away. https://www.ecospaints.net/ Edit: Just found this thread that sounds like your situation with Kilz. https://www.reddit.com/r/legaladvice/comments/6rz6qq/apartment_has_constant_smell_for_11_months_mgmt/