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A friend of mine went to see Dr Tony Yu, the derm specialist at Guelph university for her cat, he was really crusty! So, they tried around 6 different diets and her cat did best on Royal Canin Sensitivity RD-(rice and duck)- The cat is now crust free and he loves his new food! Only the vet sells it though, but she had tried so many diets she says it is worth it!
Best thing to do is have a look at what you have fed your cat in past, look at ingredients, especially the meat sources, then you need to find a diet that does not contain any of the meat proteins you have fed him in past. This is called an elimination/novel protein diet. Basically your cat is allergic to a protein in his food and whatever he has been exposed to in the past is likely to cause a reaction.
This is one of the reasons why all the new diets that have 3-5 different meat sources are bad, because finding a diet that doesn't have the proteins your pet has been exposed to is hard!
Good luck and all the best to you and your cat!
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