If you want to paint galvanised or aluminium components without the paint
flaking off after a few months you need to use an 'etching primer'. Then
put your normal primer and undercoat over that. I have never tried spaying
it, only brushing, and on hidden components so have never had to get a top
class finish. It is quite easy to handle so a good finish shouldnt be
difficult to obtain. The etch primers I have used have all been
proprietary brands bought from painters and builders merchants or even diy
stores and are often sold as a primer for painting galvanised up and over
garage doors.
Hope this is of help.
Dudley
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