05/25/2026
We’re always talking about blisters — but what actually are they?
A blister is air trapped behind something. Air behind the paper face of the sheetrock, air behind the tape. And it usually comes down to one of two things:
No prefill before taping, so there’s no mud underneath to bond to.
Or over-wiping the tape, pushing too hard and squeezing all the mud out from underneath, leaving nothing but air behind the tape.
Either way, the result is the same. Loose tape, loose sheetrock, and a blister you’ll have to come back and fix.
The details matter every single time.