The period of the effects of K2 spray may vary depending on the dosage, personal tolerance, and technique of usage. Hi, Larry: To generally be honest, I doubt it’s quite permanent. I’m unsure how it might delay under all-day Solar, and it might absolutely clean away while in the rain. https://k2-spray-bottle29494.full-design.com/the-2-minute-rule-for-k2-spray-spice-74381900