This present invention relates to oxidized, discrete carbon nanotubes in dispersions, especially for use in epoxy compositions. The dispersions can include materials such as elastomers, thermosets and thermoplastics or aqueous dispersions of open-ended carbon nanotubes with additives. A further feature of this invention relates to the development of a dispersion of oxidized, discrete carbon nanotubes with epoxy that are resistant to weather and/or crack propagation.