I had just under a gallon of thinner in my 5 gallon can. Using the T Cups I still have thinner. A very small amount of thinner to clean the barrel of the gun now. I just made an order for the 850ml cups. The 650ml is perfect for the sealer and base colors. The 850 I will use for the clear. The price is the same for all sizes. Going to buy more adaptors for all my guns, the next order will be for the smaller cups for my mini guns. No more throwing out good thinner to clean the cup. Also no more mess. My guns stay cleaner and that means less time cleaning. Thank you a Tamco. You always come up with time and money saving products.