I use the liners on my sata's I think they work good... but i'm getting ready to try the ones that Iwata has... there a disposable hard cup... I like that idea better as there like half the price, and you can re-use them if you'd like.. or throw them out.. which ever you prefer... mixing ratio's are also on the cup. it has a valve on the bottom that you can close for paint storage, or open for spraying... i've gotta try them out, seems to be better for me as i can re-use them a few times before I toss them... and if each cup is like half the price I shall safe a few bucks.