When I used it I had the same reaction later in the day or the next morning. Jon Don told me that this was normal due to the chemical make up of flex. Have been using Prochems Ultra Pac extreme. Smells like bubble gum. Have boosted it with PC Citrus pro and gotten amazing results.I have never gotten Flex W citrus to mix well. It always gets a thick slurry film on top.
Is that normal?