While waiting for Greg to confirm, i use 205 as a last step final polish so i would say yes, that's your one and only step before wax. I am a big fan of isopropyl alcohol wipedowns before wax or sealant is applied just to make sure the paint is free of anything that might inhibit the wax or sealant bond to the paint and left behind from the polish step.
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M3 + trailer hitch = oxymoron
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