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Do not seal over urine the smell will never go away! Bleach bleach bleach and lots of water. Just wear a mask. And lots of air circulation.
Bleach bakingsodsa
I just had this issue with two dogs we found who used the bathroom all over our unfinished Basement concrete floor. Here is what I did and it worked in amazing ways!!!
make sure to have a dehumidifier in the area and running
step one:
purchase a box of trisodium phosphate at your local hardware store, along with a scrub brush with long broom handle and 5 gallon bucket. Mix 1/2 cup powder trisodium phosphate with 1gallon hot water. Have a second gallon of plain hot water on hand. Work in 3x3 or 4x4 areas by dumping tsp/hot water mixture on concrete. Spread all around with scrub brush and scrub scrub scrub for several minutes making sure the tsp water mixture does not evaporate too fast. Strong ammonia smells will come out so don’t worry that’s what you want it to do!
after scrubbing and letting tsp water mixture soak into the floor for 10-20 min, rinse with the gallon of hot water you had to the side and suck up 1-2 times with shop vac.
its a long process but IT WORKS!! Let dry for 24 hours.
step 2:
purchase Anti Icky Poo
spread a thick even coat over the concrete working in small areas pretty much like was done with the tsp and water scrubbing
let it soak into the concrete (it evaporated fast so make sure to put thick coats down and the product is runnier than I anticipated) let dry 24 hours no rinsing necessary.
depending on the severity of the mess, you may have to do two coats.
step 3:
I purchased an ozone air purifier on amazon, now this replaces the oxygen (O2) with ozone (O3), so when it is running make sure no one is in the house, no animals or plants as well! We ran it for two hours (it’s on a timer) and stayed away from the house for two more additional hours to let the O3 convert back to O2. ITS A MIRACLE, we have our basement back now!!! Ozone generators are used widely in fire and mold restorations! It kills virtually all bad smells, mold/mildew etc., just be sure to research/read directions before using so you and your family stay safe!
Agree with lots of people suggesting a deep clean with vinegar and rinse. After that consider sealing it with a waterproof primer like Zinsser's Watertite to block any residual odour: https://www.rustoleum.com/product-catalog/consumer-brands/zinsser/waterproofing-paints-and-sundries/watertite-mold-and-mildew-proof-waterproofing-paint