When you run your fingers over a great paint job, you not only are witnessing the efforts of a great painter, but also the person who spent the time blocking the vehicle body prior to paint. Frankly, you can’t have a great paint job unless you have blocked the primered surfaces to perfection.
Sanding scratches and wavy panels are the result of poor blocking techniques – an art that is simply just not that hard to master.
Assessing The Situation
For this ’67 Chevelle, the body was already in pretty good shape, requiring no “real” bodywork like patching panels, grinding out cancerous edges and corners or the like; just a limited few dings and small dents.
After DA sanding the body for a first pass of sealing primer, we applied the first light coat. Here is where the blocking begins.
Starting with 220-grit paper, we selected a proper shape sanding block and proceeded to smooth the surface.
The key here is to use a lot of sandpaper (changing it often) and keep the surface as clean as possible by wiping down the body often with grease and wax remover.
Clean, Clean, Clean
Blow off the area with compressed air and then sweep up the debris on the floor so it ensures a clean work area. For a contaminant-free paint job, you need a surgically-clean work area.
Sanding scratches is an art that is simply just not that hard to master
A guide coat (light spraying of a contrasting color to your primer) will help show were you have been and make certain you don’t miss any areas when blocking the vehicle. Use you fingers to feel flaws in the surface. That is the best tool you can use to ensure a proper finish. Remember, the time you spend here will really pay off in the end.