Hello - I bought my husband two (1) gallon size Chem Dip cans. He opened one - used it - Loved it. So I went back to Auto Zone and bought the big five gallon. This is the issue: I was moving things around in the garage yesterday and when I picked up the 5 gallon bucket - It felt almost empty - like gravel was slushing around in it. I grabbed the one gallon - it did the same. The other had been opened and used BUT these two cans (1 gallon & 5 gallon) Had never been opened or used. I believe it has been about 8 months since i purchased it. I am pretty sure Auto Zone will not grant me a return. Why did this happen and what do i do now? I am out over $150.00!!!. Thank you for your response