Doc and all other pourers. If you have never used this product, you are missing out on some easy pouring. It helps solve many bad days pouring. It just plain works. No drama, no secrets and mainly no B.S. It is call "Drop Out" by Frankford Arsenal. Everyone sells it now. Barlow's, Do-It, Zeiner's and many more. It costs about $10 for a 9 oz spray can. Use it sparingly. I have a can that has lasted me going on two years, and I pour with over 100 molds. This is especially good for troublesome molds. If you have no problems with your molds, spray it on anyway, it helps in achieving complete pours. Once you use it you will never go back to pouring with out it. Once sprayed into the cavity, it will easily last for about 400-600 pours maybe more. It sprays on flat gray. Once the gray starts to wear off you will see the silver of the aluminum showing through. At that time clean off the old drop-out spray with lacquer thinner or mineral spirits, dry mold cavity and spray on another new coat and you're good to go for another several hundred pours.