I have never used tru-fuel 50:1 before as I can get non-ethanol fuel easily but the other day I was busy and I was already getting a order in that day so I added a couple quart cans to it. I never got around to using them until today and I am extremely puzzled. Neither of the cans/bottles had any sort of a seal to them. Just push down the cap and screw it off. There was no sort of a safety seal. It really makes me wonder if they have been returned by some unscrupulous person that used the fuel and returned the cans with straight gas. It does smell like gas but it would not surprise me if someone pulled that type of scam. Does anyone know if the quart cans have any sort of a seal? How about the "1 gallon" cans which are not a gallon?