Sorry I know this has been ask many times. I did a quick search and could not find it. I have used Lyman molds for years. But have read some positive feed back on the Lee molds. And for the price thought I would give it a try. Now for the question, I believe I read on here that you should boil the new Lee mold in a solution of I believe it was vinegar and water before you use it. Was this an opinion or fact. Thanks.