I installed new inside corner tape in a bathroom. After all attempts to make it smooth, there are several 4 to 5 inch long bumps of hardened compound under the tape. Yes, I mudded the outside of the tape and wet and dry sanded. the compound has thoroughly dried. Is there any way I can get these bumps out without actually tearing out the job and starting over?
You don't have to tear out the tape, just sand or scrape through the high spots and skim it. The only problem with doing that is if you have a substantial length missing at the actual joint, say over an inch.