I've been careless with glue, especially when assembling shelving from reclaimed wood for the shed or garage. Removing glue from conventional corner brackets is very difficult - with them it immediately peels off. If necessary, they can be soaked - it will not rust. Use them for checking corners, clamps to secure corners, etc. I usually use them to level the shelf, apply sealant, set it in place and screw it together. Fast and easy.