Pettit Bio-Blue Marine Hull Surface Prep Bio-Blue Hull Surface Prep is a powerful blend of cleaning agents and silica grit that de-waxes, etches, cleans, and prepares bare fiberglass for painting. Regardless of the boats age, the initial surface preparation is imperative. Residual parting agents utilized by the boat manufacturer to pop the boat from the mold may still be present, although not visibly apparent. This solvent-free product is designed to provide an easy and trouble-free method of re