I have used the regular grey PVC cement with flex PVC for years with no problems or leaks. The yellow stuff is for CPVC. There is also a yellow cement for ABS but I think it comes in a different color can, I forget. Either way, you have the wrong cement. I know Home Depot carries the clear PVC cement too, its not labeled for flex PVC though, I think it basically just says the same thing as the grey PVC cement.
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