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Once Jon gave his "thumbs up" on the block sanding, the car was then disassembled and cleaned up for its final coats of PPG's DP-90 sealer and K-38 primer. This time around, the primer will be wet sanded with 400-grit sand paper. Moved back into the booth, the GT55 is masked off, and cleaned off with DX320 to remove any contaminants off of the surface of the primer. It is very important to keep the primer free from contaminates, silicone, and greasy fingerprints because it can hinder the adhesion of the paint.