I throw away the included rubber/foam washer that's supposed to replace the putty. They are more a cushion and usually don't fit the sink drain shape. I don't know about expensive, high quality fixtures.:smile: There is putty, not oil based, that's safe for stone materials. If not at box stores, search plumbing or pro stores. The seal above is not as important as the seal under the sink. The bevel rubber pressure washer needs centering and care. Some cheaper fixtures with plastic tail piece may give you very poor seal with this rubber washer.