STRAIT FLEX WF-100 4-Inch X 100-Feet Wide Flex 4 Paper Face Composite Tape

Best tape out there for filling in greater than expected gaps and unusual angles (inside or out). The product worked incredibly and evened out a wavy 135 deg joint caused by uneven rafters used as base for new ceiling.

Good for double-layer corners, but pricey. Comes in a nice dispenser with good instructions.

Great product. Had huge gaps to fill for angled walls that plaster previously covered and we replaced with drywall (small access limited size of sheets). Well worth the extra cost to finish a project No sag and used 24 hour mud

Wouldn't touch this stuff normally, but if you strip some layers of old ceiling, and end up with a one-inch-plus gap all around the room, this will span the divide. It is thick and furry, but for a weird situation, you do what you must. If you think this will cover many sins, though, you probably don't have enough mudding experience to use it to good effect.

Worked for repair of vaulted ceiling to give a straight angle. Huge time saver. Would buy again.