The best way to fix hail damage is with paintless dent repair. By far it is a cheaper and a faster way to repair small dents and dings.
Dent repair has traditionally done by auto body repair experts who remove the damage by hammering out the ding,dent, or crease, followed by the use of auto body filler to smooth out the surface and finally they respray paint the damaged area to get it as close to the original factory paint finish.