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The POR15 / KBS type stuff was very popular on this forum a few years back.
I've used it quite extensively on parts of my W123 and to be honest I don't think it was worth the effort. I think Hammerite would have been better (and potentially easier to repair in the event of chipping and scratching)
The problem I have with POR15 is partly the preparation and partly the result. To do the job "properly" you are encouraged to buy the special degreaser and then the special prep fluid and then use the black paint. To be honest it is a ball ache especially on car parts where the degreaser actually isn't up to the job most of the time.
The results after a few years have been a very hard brittle finish that cracks and flakes away from the surface. The pedantic will say it was a preparation problem - I say it is "just like that". I've also seen a fair amount of rust creep under the treated surface.
I recommend the Eastwood rust encapsulator if you're into a one stop brush on solution
Better still the classic car restoration "crew" now seem to be playing about with epoxy primers and other solutions that have been more commonly considered to be marine solutions.
I particularly like the Epifanes epoxy primer which has the nice feeling of a zinc impregnated safety blanket. After spraying many parts of my Volvo in epoxy I've had the feeling this stuff will be longer lasting than the many many many other products I've tried to date...
...I might be writing something different in five years of course! But I'm sure I won't be going back to POR15 again...
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