G'day. When you apply the coating, you lay them out on a drying tray/rack for 1/2hour. the bullets are dry after this. they do not stick together. I will fill my trays (12"x12") with 300 9mm bullets at a time. when they have finished cooking, they are rolling around the tray. no sticking or contact marks at all.
I have 4 drying trays and 4 cooking trays. That way I can keep track of where I'm up to.
The commercial caster/coaters in OZ use trays similar to what bakers use. They coat in cement mixers a few 1000 at a time and them spread the bullets out on these large trays to dry. They might have 50,000 drying at any one time. Then they cook in a moving Buger king type oven.
So large quantities at one time are no problem.
The convection ovens are cheap and do a great job. I coated 4000 9mm and 45 bullets last night ( 2 coats) in 1 1/2 hours. That is why I have 8 trays. when one is cooked, another is ready to go straight in the oven. no waiting.
Tonight I'm going to size these and then get some more alloy ready to cast the following night.
My missus says that she has become a bullet widow