Chaz:

I don't use compressed air anywhere near the barrels, weep holes etc...I let them air dry (I live in a dry climate) then lubricate well with EEZOX when finished, including in the weep holes with a syringe....

Be very careful with compressed air around weep holes, you could blow the ribs loose IMO.......or degrade-destroy already weak areas in the solder joints on vintage barrels.......

Doug