You need to move the "wash" part to the first step. Wash and rinse with Dawn. Then wipe down the entire car with "wax and grease remover". Sanding before washing will result in "stuff" getting embedded in the surface.
Unless you have deep scratches and damage to the metal there is no need to go with that many steps. Hit it with 180 to remove the old clear. Come back with 400, then prime. Block again with 400. Spot any break through, apply a sealer and shoot the base followed by the clear.
The process is pretty much the same for the plastic/rubber parts but with a "flex" additive added to the paint. Get a hold of an automotive paint supplier. He/she can give the best advice with respect to materials. One rule I have found applies for the best finish is use the same manufacturer for all the products from start to finish.
Unless you have deep scratches and damage to the metal there is no need to go with that many steps. Hit it with 180 to remove the old clear. Come back with 400, then prime. Block again with 400. Spot any break through, apply a sealer and shoot the base followed by the clear.
The process is pretty much the same for the plastic/rubber parts but with a "flex" additive added to the paint. Get a hold of an automotive paint supplier. He/she can give the best advice with respect to materials. One rule I have found applies for the best finish is use the same manufacturer for all the products from start to finish.