Single stage does not even have a clear coat. It's all one color, so you don't have that extra protective layer on top. You need at least a base and a clear for it to look really good. Places like maaco and earl sheib use a single stage paint, where they only charge 300 to paint your car. I personally wouldn't go single stage...all PPG paints are dual stage at least as far as I know.

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2004 WRX - WR Blue Pearl
1997 Eclipse GS - Royal Sapphire Pearl