Agree with Mitch. You want to pull as much of the grease oil OUT of the porous concrete before sealing.
For cracks, am using this:
https://www.ebay.com/itm/271773621361
You can buy directly from Radon Seal on their website, but you have to pay shipping. They sell the exact same product on Ebay, at exactly the same price, but free shipping.
The crack repair is really a two person job. You do not have time to set the caulk gun down and start working in the sand. The epoxy based mix will harden in the needle. It is already a very small needle. No much bigger than one you get a shot with.
Congrats. Super cool. Already have air lines and electrical. I would ditch the current lights and go LED. I bought four footers that link (up to 10) so if one goes bad, I just go up, unplug and replace.
I have them all hung with chains. I would also hang them much higher that the current ones. You will get more even light. I went for 70 lumens per square foot of floor space. I have no dead spots.
Everyone is shocked when I turn the lights on. Feels almost like daylight.
Hopefully you don't run into all the issues I did with my place.