The black spray-on stuff just might work as a cast bullet lube ... stand them up and spray them with a coat & let dry . It doesn't take the stuff long to dry .
What I've been using it for is to spray the inside of my clean melting pot ... it helps with grunge build up and if you use a ladle ... the best use is to spray the inside and outside of your casting ladle ... lead will not adhere to the ladle , I find the insides of my ladle stays nice and clean and helps lead flow through the side spout .
The stuff is a mess on your bullet mould ... the build up is awful and hard to remove ...
Even with acetone and a stiff tooth brush ... it still hard to remove .
Tip ... If you ever need a mould release , use a Dry Lubricant like Liquid Wrench L512 Dry Lubricant ... it has micro-particles of Teflon in a alcohol carrier , after applied , (spray-on or liquid on a Q-Tip ) the carrier evaporates and leaves a micro-thin coating of Teflon ... this doesn't contaminate the cavity and/or wrinkle the bullet ... and the bullets want to jump out of the cavities when you open the mould ,
Liquid Wrench Dry Lubricant L512 is the best mould release secrete ever not known ...
If Liquid Wrench knew what this stuff does on bullet moulds they could make a bunch $$$ if they marketed it correctly ! I use the Liquid applied with a Q-Tip in cavities and when I'm done casting ...spray the exterior of block and sprueplate and any metal part to protect from rusting when stored ... in Louisiana ...rust is your enemy !
Try it on your mould ... just once !
Gary