started off using my electric sander to get the surface to a flat finish and to sand the welds flat, combination of 40 grit and 120 grit sanding pads. then out with the 800 and then 1200 wet & dry.
Then i have a machine polishing kit, First polishing wheel is course and give it a coating of dialux course step 1 soap. attach the wheel to a 4000rpm drill and blitz the crap out of it to smooth it even further and start giving a shine.
Then onto the less course wheel to help get rid of some of the scratches using a stage 2 dialux soap, this starts bringing the mirror finish through.
still got the last step to do which using a buffing wheel and stage 3 dialux soap that eliminates near enough all scratches and put the mirror finish on.
it really does take alot of work but the end results are worth it knowing that ive done it myself.