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Poly paint



 
 
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  #1  
Old October 28th 03, 02:06 AM
Miguel Lavalle
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Default Poly paint

I am considering buying a second hand glider that was recently =
refinished
with poly paint as opposed to gel coat. What is poly paint? What are the
pros and cons of poly paint compared to gel coat?

Regards

Miguel




  #2  
Old October 28th 03, 02:09 AM
BTIZ
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as long as the surface below was properly prepared.. should be ok.. that is
the standard for replacing old gel coats.. sand it down.. re profile the
wing.. and paint it..

BT

"Miguel Lavalle" wrote in message
...
I am considering buying a second hand glider that was recently =
refinished
with poly paint as opposed to gel coat. What is poly paint? What are the
pros and cons of poly paint compared to gel coat?

Regards

Miguel






  #3  
Old October 28th 03, 10:31 AM
Jose M. Alvarez
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Default

I think that Miguel was asking the difference between gel coat and
poliurethane paint.
Anyway I don't have enough knowledge about the matter to explain it!

"BTIZ" escribió en el mensaje
news:4ljnb.94824$La.83537@fed1read02...
as long as the surface below was properly prepared.. should be ok.. that

is
the standard for replacing old gel coats.. sand it down.. re profile the
wing.. and paint it..

BT

"Miguel Lavalle" wrote in

message
...
I am considering buying a second hand glider that was recently =
refinished
with poly paint as opposed to gel coat. What is poly paint? What are the
pros and cons of poly paint compared to gel coat?

Regards

Miguel








  #4  
Old October 28th 03, 02:28 PM
Steve H
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Default

Hi Miguel,
I used to own a Sportvega which was finished in a polyurethane paint. As
I understand the explanations at the time, the polyurethane finish is
softer, more elastic and cheaper to re-do. At around that time the BGA
DG 500 went to some astronomical height above Aboyne, in Scotland. I was
told that the extremes of temperature to which it was exposed and,
possibly, the rapidity of temperature change on ascent and descent,
resulted in extensive gel coat cracking; and that the polyurethane
finish on my rather ancient Sportvega would not have been similarly
affected. Lastly, if you do the prep work, a reasonable garage could
respray the glider for you at much less expense than the usual aviation
prices.
Steve

-----Original Message-----
From: Glider Pilot Network ]
Sent: Tuesday, October 28, 2003 9:46 AM
To: Steve H
Subject: [r.a.s] Poly paint


------------------------------------------------------------
Newsgroup: rec.aviation.soaring
Subject: Poly paint
Author: Jose M. Alvarez
Date/Time: 09:40 28 October 2003
------------------------------------------------------------
I think that Miguel was asking the difference between gel coat and
poliurethane paint. Anyway I don't have enough knowledge about the
matter to explain it!

"BTIZ" escribió en el mensaje news:4ljnb.94824$La.83537@fed1read02...
as long as the surface below was properly prepared.. should be ok..
that

is
the standard for replacing old gel coats.. sand it down.. re profile

the
wing.. and paint it..

BT

"Miguel Lavalle" wrote in

message
...
I am considering buying a second hand glider that was recently =
refinished with poly paint as opposed to gel coat. What is poly
paint? What are

the
pros and cons of poly paint compared to gel coat?

Regards

Miguel









------------------------------------------------------------







  #5  
Old October 28th 03, 03:54 PM
JJ Sinclair
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Default

What is poly paint? What are the
pros and cons of poly paint compared to gel coat?


Hi Miguel,
There are two "Poly" paints used on sailplanes, Polyeurathane and Acrylic
Urathane. I just repainted my Genesis 2 with Acrylic Urathane and found it very
easy to work with. Preped the non-damaged areas by contouring with 60 grit,
followed by 220 and then paint with 3 medium coats. Wet sandad with 600wet and
800wet, then wool buffer and liquid rubbing compound.
The Genesis 2 and LAK -17 are painted with Acrylic Urathane by the
manufacturer. The only down-side that I am aware of, is the softer paint
(urathane) may blister more quickly, if left too long in a wet trailer
JJ Sinclair
  #6  
Old October 28th 03, 05:52 PM
Marc Ramsey
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Default

JJ Sinclair wrote:
The Genesis 2 and LAK -17 are painted with Acrylic Urathane by the
manufacturer. The only down-side that I am aware of, is the softer paint
(urathane) may blister more quickly, if left too long in a wet trailer
JJ Sinclair


Actually the choice of paint is an option (at least on the LAK-17).
Ours is painted in painted with polyurethane. For $400 more we could
have had it painted in acrylic urethane, but we couldn't find anyone who
would say flat out it was worth the extra money. They also give you the
option of the ugly (but apparently bulletproof) epoxy paint that was
standard on the earlier LAKs...

Marc

  #7  
Old October 28th 03, 08:02 PM
JJ Sinclair
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Default

They also give you the
option of the ugly (but apparently bulletproof) epoxy paint that was


I would stay away from the epoxy paint because it yellows very rapidly and one
ends up with a ship the color of urine.

BTW, I have the color of the Acrylic Urathane used on the Genesis 2. It is;
Toyota 040/HP


JJ Sinclair
  #8  
Old October 28th 03, 11:19 PM
John Galloway
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Default

At 22:12 28 October 2003, Mike Borgelt wrote:

A few people around here got Ventus 2's unfinished
and had them
painted here with polyurethane.

Mike Borgelt


If it were now they would have been able to get them
finished in PU by the factory.

John Galloway


  #9  
Old October 28th 03, 11:20 PM
Mike Borgelt
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Default

On Tue, 28 Oct 2003 16:01:27 +0000, Robert Ehrlich
wrote:

Miguel Lavalle wrote:

I am considering buying a second hand glider that was recently =
refinished
with poly paint as opposed to gel coat. What is poly paint? What are the
pros and cons of poly paint compared to gel coat?

Regards

Miguel


All gliders in my club have gel coat, but our tow plane, a Super Dimona,
has a polyurethane paint. Some of the gliders have been refinished here
in our workshop, and the quality of this finish is far better than the
polyurethane of the Super Dimona. But this quality is probably also
better than the quality of a brand new glider. A few years ago, one of
our member who had learnt the skills for doing that kind of finish was
able to convince Schemp-Hirth to sell to him a new Ventus 2c unfinished,
arguing that he would be able to do the finish better than in the
factory, and he did it. If I understand it correctly, the main difference
between paint and geal coat concerning the quality of the finish is that
with paint it results mainly from work done before the painting and
with gel coat from work done after spreading the gel coat. Small corrections
are possible with the gel coat, I remember the owner of the Ventus 2c
adding some droplets of gel coat here and there during the process
before sanding again. Small defects become much more obvious when the
surface comes near to its final state. In a similar way, minor scratches
are easy to repair on gel coat by puting droplets of gel coat and
sanding. I don't know for paint. Also I have seen broken tails repaired
and re-gelcoated around the break with nothing remaining visible from the
break after that. Again I don't know for paint.



The words "quality" and "gel coat"(as used currently by most of the
German glider manufacturers) should not be used in the same article.

The currently used gel coat will last a few years before cracking and
causing a very expensive refinish.

Polyurethane won't crack. Take a look at an old Pik20 or Std Jantar.

The scandal is that the cracking of the gel coat has been known since
about 1977(only a couple of years after they went to that product) and
the manufacturers flat out refuse to do anything about it.

Yes there are gel coat products that won't crack but as they "weren't
invented here" the manufacturers don't want to know.

A few people around here got Ventus 2's unfinished and had them
painted here with polyurethane.

Mike Borgelt
  #10  
Old October 29th 03, 02:49 AM
Mike Borgelt
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Default

On 28 Oct 2003 22:19:54 GMT, John Galloway
wrote:

At 22:12 28 October 2003, Mike Borgelt wrote:

A few people around here got Ventus 2's unfinished
and had them
painted here with polyurethane.

Mike Borgelt


If it were now they would have been able to get them
finished in PU by the factory.

John Galloway


Schempp's are offering that now???

Mike
 




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