Which combo do you think is best to use that does not make the hair greasy?

Mousse is primarily used when blow drying the hair. Sea spray shouldn’t make your hair greasy at all, hairspray shouldn’t be used unless you are keeping your hair up in a way that it won’t stand up itself. It would help to know the type of hair you have, and what style you are trying to achieve. I can tell you what to use for maximum effect without greasy and oily hair.

the first one, i would assume sea spray dries out your hair rather than make it greasy. hairspray can make hair very greasy

I have very thick hair and if i put in a lot of products like syrums, gels, sometimes lots of hairspray and too many products my hair usually is very greasy and oily.

What do you think of using mousse, and heat protectant when the hair is wet and then blow drying the hair? Do you think it will become greasy? AFTER the hair is dried, curls/waves will be processed throughout the head by using curling iron/straightener and to finish off.. a little bit of hair spray. Do you think this hairstyle(s) will stay in for school as well as looking non- greasy/oily?