All the body filler on our 1965 Chevelle project has been block-sanded straight, bringing the car one step closer to paint application. The next step is to apply several coats of Standox Sprayable Polyester .. a high-build sprayable body filler intended to fill any pinholes or sanding scratches in the body filler layer below. Tiny pinholes and sanding scratches can be barely detectable in filler, but they become magnified under the shiny paint and clear coat of final paint, so it's crucial to take whatever steps you can to eliminate them from the car's surface before spraying paint. We applied several coats of the Standox product, which leaves a highly textured surface when hardened, which might appear to be a step backwards in the straightening process. However, most of what you see here will all be block-sanded off, leaving a solid white layer of perfectly smooth substrate ready for the final application of primer before paint. When properly sanded, the poly leaves no traces of pinholes or spreader marks, and it sands smoothly with minimal effort. But you'll see the whole block sanding process in the next chapter of our '65 Chevelle.