Refinish of Ventus b wings.

The only short cut I found was to uses very heavy grit paper to remove the
gel coat. I used 60 grit with a 7" rotary variable speed sander. As I got
close to the fabric I changed to 80 grit. Be carefully you don't sand into
the fabric. I can also recommend that when you profile your wings make sure
you roll or spray on enough surfacer, so you don't have to do it twice. I
also recommend using at least a 3' or 4' long aluminum extrusion to profile
the wings. Use adhesive paper or spray on adhesive. Make sure it is flat.
I intially used 80 grit to profile. The second time I used 200. Then
sprayed DCC acrylic urethane. So far I have 172 hours into the project. But
it finally looks shiney. Estimate about 25 hours left to wet sand polish
and assemble the flaps & ailerons.

Richard
www.craggyaero.com



"Ian Forbes" wrote in message
...
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