Use a utility knife to cut out the air pockets and reskim those spots. If there’s one that’s directly over a joint you will have to put more tape over it. Air pockets are usually a sign of not enough mud applied before tape, wiping too much mud out when taping, or using a mud with poor adhesion.


This is the only way.


Until you cut out the blisters and either re tape (if you see joint) or re fill the spots they will stay there. feathering will do nothing for the blisters and only waste your time.


Dip your tape in a bucket of clean water, remove excess water by pulling tape between two fingers, and apply mud/tape as usual. This is what has helped me prevent blisters best. Prevention, not a fix to your problem.


While wetting tape may make it easier to work with, it also reduces adhesion.


The reason you get air pockets is because you have a dry spot underneath the tape. You either didnt apply the mud evenly or you wiped it too tight. You can coat overtop of it 100 times and the blister will still be there. I would cut a semi circle around the air pocket, apply some mud under the blister and stick the tape back down being careful not to wipe all the mud out.


I hung new sheet rock abutting to lath and plaster. I think what happened was, there were a couple 1/4 gaps here and there (because the plaster just crumbles when you touch it) and when i applied the mud and put the tape on it, the mud that filled in those 1/4 gaps caused the bubble. Not being experienced enough i thought it would go away after the first coat. I later learned if i scrape a little mud out of any gaps the tape goes on nice and no bubbles. I am still stuck with the few bubbles to fix and it seems that cutting and laying a new piece of tape is the only way. I am worried that i will end up with too much of a bump though, my second skim was a decent amount…