So, I went digging around their website a little more and came upon the FAQ secionI looked into using this on a filter, and the MSDS states NOT to use it around your pets food and water (Don't remember exact wording) and not tested for potable water. I'm not taking the chance around my fish because of this..... Like most of us, I have WAY too much money invested to take the chance.
http://flexsealproducts.com/shop/liquid/
It appears the spray and liquid are different in composition.
In the FAQ, the liquid formula states:
"Q: Is FLEX SEAL® LIQUID safe to use around plants, animals and food?
A: Yes, once fully cured, FLEX SEAL® LIQUID is safe to use around plants, animals and food."