Should I spray hairspray on my hair to set my tresses before or after using electric hair rollers?

My hair has a texture that it gets greasy as and when put even a small amount of serum or leave-in over it. Since my hair is straight and somewhat thick as well, my friend got me electric hair rollers as Christmas present. I have tried using it over my hair, as directed on the packing, but my hair seems to be frizzy now. I have been using it for last a week and half, but my hair has started looking tangled and unmanageable now. I wanted to know from some hair expert if I could use hairspray after or before using electric hair rollers on my hair, so that my hair look set for at least 6-7 hours. Please advice aptly! Thanks.