These are the are the instructions that came with mine:
1. (A) Spread small amount of glue (index finger size or less) on leather with finger covering entire decal area including type in thin glaze. (Let set while following B). Glue dries invisibly and cleans with water so absolute exactness is unimportant. A wider circumference is better so entire decal gets glue as decal is moved into desired position.
(B) Immerse decal in shallow bowl of warm water for approx. 1 minute or until decal loosens. Do not allow to loosen so that it separates from backing while in water. Remove and drop of excess.
2. Position decal sheet onto sleeve. Gently cover approx. 40% of decal from bottom down with moist sponge. Gently but with consistent pressure pull decal backing upward, separating decal and exposing decal bottom first. Ensure during process that the U.S. Army Air Forces is kept straight and uniform to prevent tearing.
3. When "U.S. Army Air Forces" type is fully exposed, straighten if flexed or twisted. Continue process detaching decal. Ensure that sponge pressure does not impede separation of decal from backing.
After complete decal is on glued surface, position to preference.
Use sponge and wet forefinger to flatten and remove bubbles and creases.
Clean excess glue with sponge or wet forefinger when fully dry.
When satisfied with installation, carefully lay sleeve straight to cure 1 day.
Good luck with the project!