The Overflow rules are on YS 214, but they expressly bar you from taking offensive actions (which applying Aspects to other people, i.e. Aiming, is). Further, the rules for using a spell to apply Aspects are different from the rules for doing it with a Skill, namely that by Spell the extra shifts you kick in to duration don't make it sticky, they just make it last for that many more exchanges at which point it simply poofs (obvious exceptions, like lighting something On Fire, not withstanding). As written, evocation maneuvers say "...a temporary aspect...," it's only when you get into Thaumaturgy that it says you can slap on more than one at a time.