Janusz Kesik wrote:

I used to own a share in Nimbus II that was resprayed with poly

Maybe it has been painted with polyurethane paint since new?

No, it was painted by the previous owner. Much of the manual work was done
by his son and his son's friend. I spoke to the friend about this, that is
how I know it was "Durathane K".

The only problem we had with it was doing minor repairs. It was very
difficult to re-spray a small area without a visible brownish "water
mark"
where the new and old paint met. But we just lived with a few water
marks.

The paint You use, is fresh, new, etc. and the paint layer which has been
laid few years ago is just "old" due to sun, dust, and anything else with
what has it been in contact since painting. They're just different
because of age, and even if You have the same paint (the same catalogue
No.) effect most likely will be different in any case.

The effect was cosmetic, and not readily visible, but annoying because no
amount of effort seemed to get rid of it.

I found that sanding the adjacent area with 1200 wet and dry prior to
spraying seemed to help prevent the mark, but it was always there to a
greater or lesser extent.

(Just like cracks in gel coat - they are always present, just the extent
varies!)

Car panel beaters always spray an entire mudguard, door, bonnet etc to avoid
this problem.


Ian