I think I am going to use Duplicolor like many others have. Is the 1200 degree or a the 500 or 600 degree better for valve covers and timing cover and so forth. I want to paint them the same color as our stock silver/gray looking alternator, plenum and so forth. Will the valve covers need sanding at all since they are plastic or just cleaned really good? Any in sight is helpful. I dont want blue or red valve covers either... Hate that look...