I've found there to be basically three types of leave-in conditioner available (there could be more, but this is what I've noticed)

The first kind is generally geared towards people whose hair tends to get limp easily. Mostly, these are for people with straight hair that's fine. Their ends may be damaged, but they can't have anything with substance in it, or their hair will get weighted down. For us, this type of leave-in is more or less like scented water. Sometimes they may throw in something sticky, but for the most part this is way too light for us to even notice it doing anything in our hair. Our hair just laughs at a product like this.

The second type is meant for curly hair, but damaged hair. This means these products, often geared towards African American hair, are often little more than glycerin, and/ or pure oils. These tend to make hair too greasy, and can damage our hair follicles if they are glopped on the scalp. Often these are Jheri-curl activator-like products. These are best to avoid.

The third type is more a true lotion for the hair. These often have the same ingredients as a rinse-out conditioner, however, they usually aren't sprays. Usually they are in bottles. These are also usually marketed to African Americans, and I've used many of these in the past. Of the three types, this type of leave-in is the best, but again, usually this is a lotion in a bottle, not a spray. I don't use these type of leave-in products anymore because I have found nearly the same ingredients in the conditioners I recommend, and for a much cheaper price.

That being said, using a spray conditioner could be fine. It depends on what's in the conditioner.Some conditioners have sticky ingredients (similar ingredients to those in gels and hairsprays), which will build up and get crunchy and sticky. Some conditioners are also watery and might disappear by the time they dry, and not be very moisturizing.