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Here's why mediablasting is so important on very rusty cars. Years of paint, undercoat, and other crud can hide small rust spots, pinholes, and metal cracks/fatigue. These small rust holes found on the firewall could easily have festered under moisture-laden layers of dirt and continued to weaken the metal and cause great problems years down the road. Now, it's simply a matter of a few minutes with the MIG welder closing these holes up or possibly making a small patch to replace the rusty area.