Question on sanding the intake
2, search seriously works on the boards here... TONS of us have sanded our intakes.
3, try 80-100 grit first, move on to 150-200 grit, followed by about 300-360 grit and clean between each step well. Paint adhesion promoter is a fantastic prep agent. Spray very light coats allowing some flash between. Don't be surprised if you're looking at 8-10 light coats before you're happy with the coverage. Clear coating afterwards is recommended.
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