I think Temper's technique is spot on, but there is nothing wrong with Parade Gloss, you just have to be careful not to scuff it, as it's not as hard a coat as other shoe polish.
Once you have the base coat established, a light coat of polish, buffed with a pad made from nylon pantyhose will bring up the spit shine easily.
Keep a window open when you are polishing boots, the fumes can give you the grandpa of a headache, and if you use flames(?) to heat the boots, be aware of the fire hazard- polish is VERY flammable.
(Technique courtesy of the Army, the last of the spit shiners)
Good luck, hope the Sarge likes the results.