Humidity or cold weather can cause a finish to turn white (blush). NO BLUSH™ PLUS Retarder re-flows the finish and allows the trapped moisture to escape.
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I sprayed a clear coat on a guitar project on a day with too high humidity and learned about "Blush", that ugly white patch that didn't go away after a few days. I literally just received this blush retarder minutes ago and after 2 light mist coats can no longer see the blush. Amazing.