Yes, however, 1) Chemically-epoxy does not adhere to epoxy past 24 hours.
2)If past 20-24 hours area must be either sanded(60-80 grit), better iamond grind/shotblast.
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Thee is no necessity to do that. Any 2 part epoxy is tough enough to withstand anything.
If your old epoxy is good then you can apply over it, but there are many facts to consider before applying over existing epoxy coating.
Yes, you can on some one-part epoxies; however, be sure to check the data sheet for the epoxy. Most solvent based epoxies will act as a remover when placed over polyurethane.
You can definitely use latex paint over epoxy. In fact, it is recommended to use latex over epoxy by the paint manufacturers, rather than using epoxy over epoxy. The latex adheres better and if you then want to use epoxy next time you paint, you have a nice coat of latex between the layers. If you use epoxy over epoxy, often the paint will just peel off in layers once some time passes (and sometimes right away).
I wouldn't. I would try to get the first one to cure somehow, possibly by warming that area.