Tempering your blade one more time at 325 will not hurt it, in fact, if anything, it may help a little bit. On the other hand, I use Duracote. I have it on about 200 knives now and haven't had any problems with it. It's not as tough as Cericote but it doesn't require oven baking. Cericote and other coatings that require baking are, IMO, troublesome. When baking, they OFF-GAS at any microscopic impurity on the knife ( like a finger print, or a spot of oil or dust that fell on there) creating spot like a zit. Some of them require two bakings. I just didn't need the extra trouble so I went with the Duracote.