argent silver paint code???

HOW CAN YOU TELL IF A WHEEL IS POWDER COATED AND NOT PAINTED ? SEEMS TO ME WHEN I HAD THE REAR WHEELS MADE INTO 15 INCH 4 INCH PATTERN THAT STOCKTON WHEEL MIGHT HAVE POWDER COATED THE RIMS. USING PAINT ON A POWDER COATED RIM I THINK IS LOOKING FOR A PROMBLEM