just like bbq slow and low, with even treatment of sauce = mmm mmm good
besides blotching which is mostly due to uneven paste application, my biggest beef if BLEACH WHITE, like that darn 8 bit idiot, everything he does turns titanium white and blotchy, ya that keyboard was platinum silvery grey, not RGB 255,255,255, and that osbourne was medium grey, not winter alps snow
I've been reading about Retrobright since it's start in 2008 but only now started to get some experience with it, thnaks to Fred_M.
As far as I understand, you actually cannot "overdo" retrobrighting. It is NOT something like bleach. If the process was like bleaching, every part of the plastic would become lighter equally. So, parts that were more yellow would relatively still be more yellow than oher parts, but that is not how retrobright works, it only "attacks" the yellow.....
Proof for this are f.i, keycaps which are usually more yellowed on top. Even though completely covered in peroxideand fully exposed to UV light, the outcome of the plastic is very even.
I've watched a number of 8 bit guy's videos and most of his results are simply good and look like returned to original color.
The Osborne actually was as light as it turned out, maybe his camera is not the best in color or his lighting is a bit too much, but I've searched the web for printed matter (flyers etc.) and the Osborne was near white....although of course pictures/scans of (old) printed matter is of course also subject of different color appearance....
Except for they keys and the leather handle (the last was a very stupid mistake, I noticed he had packed it in the plastic wrap too and immediately felt that that was wrong....) the Osborne wasn't ruined. The streaking can easily be fixed by doing another (good) session.