Did you order the optional mounting method? Uses steel plates that bolt down to the slab along the sides and the steel screws to this? Much easier than building the gutter and mudding the steel into it.
There are lots of curing agents to use on cement. They are generally dust control sealers also. They are not resistant to oils and fuels however. I keep large sheets of corrugated cardboard under everything I have that drips any at all, or wherever I am working. Only way to "seal" the floor is to properly paint it, after the concrete has dried out, usually about 6 mos after a pour.
24x20 is tiny, I hope you simply could not afford more. If you could afford it, you should buy larger. What about doors? what did you buy?
Lots of information on lighting. Look thru the Garage Gallery and also do searches, Its been discussed to death, even recent on-going discussions are found.
Do you have permits to deal with? Have you talked to building inspection people to see if there will be any problems? We could ask all kinds of questions of you, but it would be easier to give us an idea of where you are (northern Texas, or South Dakota, or where?) and if you are in the city, the country, a subdivision, on a small tract, large tract, what kind of access to electricity, gas, etc you have.......
Tell us all you can, it will make answering questions easier.
Charles
