What is a good substitute for potato starch?
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Cornstarch, tapioca, or arrowroot are most commonly recommended to give you the same effect as potato starch.
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It's hard to answer without knowing the dish. But lastnightsdinner's answers are on target, with cornstarch being the cheapest and most easiest to find. Arrowroot will give a nice gloss to sauces but I don't use it for much beyond that.
Thank you both. My cheesecake recipe called for potato starch which turned out fine but not as smooth as I would have liked.
If you used potato starch and it was not smooth, is it possible you had potato flour instead?