Mirrorcoat™

Yes.  System Three offers a sanding and buffing kit for sale on the website.  The video shows its use.

MirrorCoat Buffing and Polishing by System Three from System Three Resins, Inc. on Vimeo.

A white paper literature piece can also be downloaded from the website here:

Guide to Buffing and Polishing

The rule of thumb with cured Mirrorcoat® and how much heat it will tolerate is this:  If an object is not too hot to hold in your hand, you can set it directly on a Mirrorcoat surface which is completely (more than a week) cured.  If it is hotter, you must place a coaster or hot pad underneath the object.

The sticky spots are most typically uncured resin or hardener which hasn't been completely mixed in.  If it's excess resin it can be removed with a strong solvent like lacquer thinner.  If it's excess hardener it can be removed with soap and water.  The voids can be filled with small quantities of newly-mixed Mirrorcoat, carefully using a spatula or squeegee to smooth out any excess material.  Let this cure 24-hours and lightly sand the surface with medium-coarse sandpaper.  Finally, apply an additional flood coat at 4 fluid ounces per square foot.