many questions about repairing/replacing stringers

[carboncow]

We have stripped the decals off the boat and I don't think we have to sand it down due to the shine still in the hull. I'm hoping simply compounding, polishing and waxing will do. I've got a buddy who does vehicle wraps and will work with him on new graphics to cover up the old ones and the shine left by the stripes.

What do you use the prep the hull especially with the glues from the old decals. we used a special wheel to rip the decals off the hull but the glue and such remains.

I know it should be washed with a acid solution (delimer) but can I acetone the hull...it seems to want to talk that adhesive off that adhesive mover cannot budge. Or will acetone damage the gelcoat in some way?