Never heard of a 1-part epoxy.
If you want to do it right, find a company that sells epoxy and sealers for concrete. The stuff will not be cheap, but it will seal like mad. Otherwise, I like the VCT stuff. I recall pros actually etch cured concrete with a nasty chemical. Can't recall the chemical used--maybe an acid, but I think it's some highly volatile compound (probably causes male impotence or something).
jurgen