Sorry if my 993 is too new for this forum, but I figured with all the restorative goings on here that you might be able to help me.
I've had the fan housing for my '98 C4S vapour blasted, along with a bunch of other engine and HVAC components. They have all come up lovely and shiny as new, so I would like to keep them that way if possible without them turning in to a corroded mess.
I've coated the alloy air tube, air diverters, a/c compressor and a/c pedestal, with ACF-50. This should keep them fresh for a while to come and I can top up on visible parts once installed as required to maintain the appearance.
When it comes to the fan housing however I am not so sure on the route to take. I understand the part is a magnesium alloy and with that painting can be difficult as the mag can gas and push the paint off. Also this isn't the factory finish. On all cars I have seen and as was with mine, the part is a flat grey non painted finish. Post vapour blasting, mine is now bright silver as you can see in the pic attached.
Does anyone know if any coating was used by Porsche from new? Or if you have any advice on how best to tackle the refinishing of this part keep it looking fresh please do share.
Many thanks
Dominic
![Image](https://i.imgur.com/EHOZvSw.jpg?1)