sure thing what condition is the paint in?
a good sealant by hand would be
Sonax Polymer Net Shield.
something to use with the machine with an Uber Black Pad -
Menzerna Power Lock or
Auto Finesse Power Seal
for a polish you can use
Menzerna SF4000 or
Sonax Perfect Finish 4/6 with an Uber Green Pad
if the car has some deeper scratches/swirls imperfections you may need
Menzerna FG400 or
Meg's M101 with an Uber Yellow Pad or Uber MF Cutting Pad