Well I got my Tax SA filed at 11.55PM last night, so time to relax a bit now and get on with the bikes.
Sh*tty weather outside, so spend the last hour with a cuppa reading this brilliant thread from Hondaman on the USA site on the rebuild of his CB750 engine, with lots of factory history.
http://forums.sohc4.net/index.php?topic=122379.75In it, a guy confirmed my thoughts on chemicals to pre-etch aluminium to get paint to adhere. gonna get me some chromic acid (I know it's nasty stuff BTW before someone chips in but I have access to a lab fume cupboard).
'Orcadian' Do you remember what they used at BA in Brough, when you worked there?
"Chromic as you probably know has sulfuric acid and a dichromate salt.
It's the recommended thing for aluminium being prepped for paint (organic). In the aircraft industry we usually refer to it by the trade name "Alodine". Such as Alodine 1201. (Gives the aluminium a yellow color btw)"
Ash