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The downside of a great paint job

 
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d-m-hague(at)comcast.net
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PostPosted: Sun Nov 18, 2007 4:51 pm    Post subject: The downside of a great paint job Reply with quote

Did Ultrastars with factory welded cages come prepainted?

My US has a gleaming gloss black paint job on the cage, boom, and
struts. It's such a deep gloss it almost looks powder coated though I
doubt it is. Unfortunately there's a downside to that as well. After
flying for awhile today I decided to take a break and warm my
hands. Looking things over while I was waiting, I noticed what looked like
some odd cracks in the tailboom just past the aft end of the internal "H"
section. A little scraping with my pocketnife didn't reveal whether the
cracks were just in the finish or the aluminum and I want to continue
flying for many years so I packed it in and went home, where (I trailer the
plane and keep it at home) I sanded down through the finish to the bare
aluminum. Big sigh of relief, the apparent cracks disappeared with the
paint; after close inspection with a jeweler's loupe revealed nothing now I
just have to refinish the area. Not sure what I should use to refinish it;
zinc chromate of course followed by ???

Has anybody heard of tail boom failure at that point?

This isn't the first time, though, that I've been fooled by the apparently
brittle paint cracking. Spots on the cage and the wing attach fittings
were more obviously just in the finish, though. It's thick, and strangely,
5 distinct layers thick, none of which succumbed to MEK. The first is
obviously zinc chromate, then red, then olive, more red, and then the black.

-Dana
--
Drink wet cement, and get completely stoned!


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worrybear(at)verizon.net
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PostPosted: Sun Nov 18, 2007 5:33 pm    Post subject: The downside of a great paint job Reply with quote

Dana, I don't think any of the Ultrastar cages were factory welded, I could
be wrong. Sounds like a couple of repaints.
Dan Walter
Ultrastar, UL202

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---


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d-m-hague(at)comcast.net
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PostPosted: Sun Nov 18, 2007 5:45 pm    Post subject: The downside of a great paint job Reply with quote

At 08:32 PM 11/18/2007, DANIEL WALTER wrote:

Quote:
Dana, I don't think any of the Ultrastar cages were factory welded, I could
be wrong. Sounds like a couple of repaints.

I had thought the later ones were factory welded, but I too could very well
be wrong. Repaints are likely, since the plane was bent at least once in
years past.

-Dana

Do Not Archive

--
The difference between golfing and flying: In golfing you hear "whack...
shit!" and in flying you hear "shit... whack!"


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planecrazzzy
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PostPosted: Sun Nov 18, 2007 6:03 pm    Post subject: Re: The downside of a great paint job Reply with quote

Because you might have a hard time "matching" the paint....

You could paint some sorta stripe or design/checkers...

Just a suggestion....

Gotta Fly...
Mike & "Jaz" in MN
.
.
.
PS I thought "ALL" the cages were factory welded....I've never heard
of a Kolb kit any other way....


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Dennis.Kirby(at)kirtland.
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PostPosted: Mon Nov 19, 2007 1:40 pm    Post subject: The downside of a great paint job Reply with quote

<< My US has a gleaming gloss black paint job on the cage, boom, and
struts. It's such a deep gloss it almost looks powder coated though I
doubt it is. >>

Kolb Friends -

A dark paint job on the cage makes any cracks difficult to spot.

The advice that I heard and heeded was, if you choose to paint or
powedercoat your cage structure, make it a light color. This way, any
weld cracks can be easily detected.

Dennis Kirby
Mark-3 Classic, 912ul in
Cedar Crest, NM


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jb92563



Joined: 23 Mar 2007
Posts: 314
Location: Southern California

PostPosted: Mon Nov 19, 2007 1:46 pm    Post subject: Re: The downside of a great paint job Reply with quote

I was reading an early Ultrastar advertisement just last evening and it said that you could purchase welded cages from Kolb.

I believe they came prepainted.

Mine has a very light blue coating with a grey primer underneath.

It is so thin that everything show up well and I can inspect welds.

What is a good primer for the Chromoly cage, I need to do some touch up?

Zinc Chromate is just for aluminum right?


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_________________
Ray

Kolb UltraStar (Cuyuna UL-202)
Moni MotorGlider
Schreder HP-11 Glider
Grob 109 Motorglider


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planecrazzzy
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PostPosted: Mon Nov 19, 2007 2:09 pm    Post subject: Re: The downside of a great paint job Reply with quote

If your gonna put Stitts on it....That means MEK....(melts most paints)

Epoxy primer works best...

I used Zinc Chromate , then 2 part epoxy paint....

Gotta Fly...
Mike & "Jaz" in MN
.
.
.
.
jb92563 wrote:
I was reading an early Ultrastar advertisement just last evening and it said that you could purchase welded cages from Kolb.

I believe they came prepainted.

Mine has a very light blue coating with a grey primer underneath.

It is so thin that everything show up well and I can inspect welds.

What is a good primer for the Chromoly cage, I need to do some touch up?

Zinc Chromate is just for aluminum right?


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gaman(at)att.net
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PostPosted: Mon Nov 19, 2007 4:32 pm    Post subject: The downside of a great paint job Reply with quote

I believe that Kolb wanted us to use epoxy chromate on all the steel tubing H sections in the wing and fuselage.Don't know how it would respond to top coats containing MEK for the rest of the steel.

planecrazzzy <planecrazzzy(at)yahoo.com> wrote:
If your gonna put Stitts on it....That means MEK....(melts most paints)

Epoxy primer works best...

I used Zinc Chromate , then 2 part epoxy paint....

Gotta Fly...
Mike & "Jaz" in MN


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