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Quick Fix Plus 6.4 Questions Answered  Quick Fix Plus has remained one of the most recognized synthetic urine products on the market for years. With the latest 6.4 formula continuing into 2026, buyers are still asking the same important questions before making a purchase. This guide breaks down what Quick Fix Plus 6.4 is, what has changed, and what you should know before buying. What Is Quick Fix Plus 6.4? Quick Fix Plus 6.4 is a premixed synthetic urine formula designed to replicate the c …