I solved that problem many moons ago by keeping my welding rods in the hotpress.
S-W-M-B-O objects from time to time, but I suffer from deafness from time to time, as required, so it,s not really a problem.
The good news is that the rods remain dry and the flux never breaks away, so it,s worth a try.
Rods kept in a cold workshop seldom perform well
Wrap them up in a tee shirt and say nothing about them.