Here's a pic of the first polished plenum. On its way to its new owner as we speak.
I had problems with the first polishing company, they didn't do a thorough job of it and i took it to another company who finished it off. Left me slightly out of pocket but lessons were learned.
May have to find another company to do the job as they told me it was more labour intensive than they imagined!! So the price will have to go up to at least a 100 quid! if not slightly more, unfortunately.
Personally i would powder coat my plenum, quicker turnaround, easier to keep clean and less bl@@dy hassle.
As i said before the other alternative is to shot blast the plenum, this makes it look brand new, and is the cheapest option at only 40 quid plus postage.