I used a can of it right away with another from an older batch I had and they burned the same.... I am pleased with my purchase... I would recommend.... Burned for a little over 3hrs... Crackled and popped with not mess and no fumes..... I have used all the different brands of Gel Fuel Cans and they all burn the same. Best Price on the lot of 24 was WayFair!  I hunt for the best prices for certain items.