I have a nice newly blasted aluminium engine block and head. What is the best treatment to retain the natural finish against the dreaded 'white rust'. I have considered alu paint but that requires scrupulous cleaning and etch priming. I am edging towards a full treatment with ACF 50 ( hope I have remembered that right ) with occasional repeat treatments. What is the experience of the collective? Advice appreciated. TIA.

Get it anodised?
But Ii suspect if it was as smile as that all the super cars would have it

I've just ordered some of this to coat the aluminium on my car - http://www.everbritecoatings.com/ProtectaClear.htm

Sounds almost too good to be true so hope it does what it says!