It can be difficult to get all the way up into these corners with a square-end blade, but the round tip of the BFE1420 will reach up into the corner and cut the urethane. Some vehicles such as Ford Windstar, Econoline, Explorer, Ranger, newer Chevy/GMC and Mazda pickups have a moulding with a piece of metal inside. If you cut into the moulding the metal insert makes it difficult to cut. Also, many encapsulated glasses have a very dense encapsulation material that is difficult to cut.