Typically the process for simulating steel finishes, as well as pewter, bronze, etc. is a 2 step process. Not sure if RL2202 will work as an effective base color or not but you should try it. The basic method for creating a ‘steel’ effect is as follows;
1. paint a metallic base coat
2. Apply metallic glaze by using the ‘pounce’ method
For the base coat we usually use a silver metallic paint like ‘Hammerite’ (or Hammerall), often used for radiators and similar. It is heavy duty stuff, and found in most paint supply stores. For a Bronze finish we would use a gold paint instead. The next step is to create a glaze by mixing Raw Umber Universal tinters with Black Tinter and Burnt Umber Tinter. A ratio of 4:2:1 should work. Eliminate the Burnt Umber entirely (which adds a hint of earthiness) if you want a harder ‘colder’ appearance in your steel effect. Mix these tints with a semi-gloss or satin oil based varnish and mineral spirits. You can go pretty dark with the mixture, and keep it pretty loose, about the consistency of milk.
When applying the glaze, brush on, and then use your ‘pounce brush’ to mottle the surface, creating a sort of pitted or ‘spotty’ effect. Follow the ‘pouncing – oil based’ tutorial on this web site for instructions on making a ‘pounce brush’ and the technique. You will have to work quickly, moving from one area to the next in an even progression.
Try this glaze mixture over your Ralph Lauren color. It may work OK. Just remember, in order to get that truly metallic look (and reflection) the base coat has to be pretty opaque and shiny, so if the RL2202 is very reflective, it will work, if not, then you may have to repaint with a better silver paint. Experiment with the thickness of your glaze. For the Diner look you may want to apply the glaze very loosly or ‘watery’, giving the metal a softer ‘steel’ look. Or go darker – creating a stronger, bolder metallic look. If you don’t like the process, you can always wipe clean with mineral spirits on a clean rag. Just be sure to use protective gloves.
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