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Depends on how agressive of a color sanding your planning on. 3 coats is usually sufficiant enough if your just cutting down a little of the peel and the dirt nibs starting with 1500 or 2000 grit. But if your planning on getting a little crazy and start cutting with 1000 grit to acheive a flatter finish then you may run into trouble with sand throughs with only 3 coats especially near edges. It really depends on your expectations as to how fussy of a job your going to do. Anyway the more agressive your going to be you may need more material to sand into, roughly 4 or even 5 coats to be safe.
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