We have found that most two-part or water-based paints will work well over System Three epoxies. This includes house paint. Solvent-based lacquers are also compatible. One-part alkyd-based(aka oil-based) paints contain drier compounds that can be incompatible with epoxy hardeners, so the paint or varnish must be tested for compatibility before use. If the paint isn't dry in the time it states on the can, it's incompatible.
Surface Preparation: Allow the epoxy to reach full cure before priming or painting, then follow the manufacturer's instructions for surface preparation on the can.