Thanks for asking. I double-checked my build records, and saw that I misremembered a bit.

The Interrogator, regular sized, was painted with Duplicolor Perfect Match White Pearl.

The Interrogator mid-sized, this build, was a two-part paint scheme. The base paint was DupliColor Perfect Match SuperWhite II. The pearl effect was an after-effect, applied with Rustoleum Pearl Mist. I like the effect of the pearl mist, since it works over other paints, and only needs a light dusting.