two dollar rod oven

[jtybt]

I have half a can of 7018 some one me that has developed a coating of white powerdery stuff. What can I do to get them usable?

[performance]

You could try to rebake them, but they're tedious to do properly, and it is likely the flux will crack off.

You'll be better to use them for practice, or throw them out/recycle them.