evinX Posted January 28, 2018 Share Posted January 28, 2018 Well, to my horror it seems the TTs got aluminium covers and the NAs got magnesium with a mix of alu in it NA ownership is tough Now if mine were aluminium a good old polish, or high heat primer/base/clear would do. But as magnesium is 'pourous' it likes to breathe gas which is why the NA valve covers always have dark spots, soaked oil. So a polish wont last and painting may be literally pushed off by escaping gasses I really wanted to polish my spares that i just got but dosent seem worth it as it will eventually return to a grey cast finish. Has anyone ever powder coated NA cam covers? and can they really warp? cheers Kev (from tonight a lifetime member ) Quote Link to comment Share on other sites More sharing options...
Tyson Posted January 28, 2018 Share Posted January 28, 2018 Have a read about zinc chromate primers and look at how people paint magnesium alloy wheels. Quote Link to comment Share on other sites More sharing options...
jagman Posted January 28, 2018 Share Posted January 28, 2018 Alodine (wipes available now about £5 ) pre treatment , then chromate etch primer and then filler primer and top coats - job done Quote Link to comment Share on other sites More sharing options...
evinX Posted January 28, 2018 Author Share Posted January 28, 2018 Cheers dudes will look into it Quote Link to comment Share on other sites More sharing options...
ripped_fear Posted January 28, 2018 Share Posted January 28, 2018 (edited) My old Na had polished covers for a while and they staid looking great with a bit of meguire metal polish. However with the fidly bits around the y pipe being nie on impossible to get I went for the painted option in 199 done profesionally at a body shop and to this day around 6 years later still look great from what I know Painted When they were polished Edited January 28, 2018 by ripped_fear (see edit history) Quote Link to comment Share on other sites More sharing options...
evinX Posted January 28, 2018 Author Share Posted January 28, 2018 Jake, do you know what process they did and what primer most importantly? Quote Link to comment Share on other sites More sharing options...
ripped_fear Posted January 29, 2018 Share Posted January 29, 2018 Jake, do you know what process they did and what primer most importantly? It was done in the normal way of painting body work, prime, paint clear. I will ring dad if you need specifics but i know he did it as he normally would, the same way we have done all my engine bay bits on both builds Quote Link to comment Share on other sites More sharing options...
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