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  #21  
Old 07-29-2022, 05:27 PM
Charlie Myres Charlie Myres is offline
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Nice work Sune.

A pretty car to look at,

Cheers Charlie
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  #22  
Old 07-30-2022, 01:49 AM
Pehr Pehr is offline
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Well done with the moulding. Very interesting to follow.
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  #23  
Old 07-30-2022, 06:28 AM
dwmh dwmh is offline
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Your bumper horns came out really well. You're making great progress, Enjoy the journey.
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  #24  
Old 07-30-2022, 06:49 AM
Jaroslav Jaroslav is offline
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Sune. Hats off with that polyurethane..... great result.
If you make stainless bumpers, it will last forever. I don't know how the polyurethane will last. It would probably be good to protect it superficially. It degrades after some time.?
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  #25  
Old 07-30-2022, 08:30 AM
Marc Bourget Marc Bourget is offline
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Jaro,


There are a series of stabilizers, photo, chemical, etc. available to stabilize polyurethane.
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  #26  
Old 07-30-2022, 03:28 PM
Jaroslav Jaroslav is offline
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Marc, I know, I use industrial polyurethane. After some time it degrades and changes color.
Rubber has a longer life.
With industrial polyurethane, I was taught about the effects of light. And if I don't use the tool for a long time, the polyurethane will change its properties - it will lose its elasticity.
If you keep pressing the polyurethane in a press and store it in the dark, it will last a long time with its original properties.
That's why I'm asking about long-term experience with cast polyurethane. Among other things great material.
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  #27  
Old 07-31-2022, 02:23 AM
Sune Sune is offline
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Thanks for the kind words

Jaroslav, i have thought about the degradation. I came to the conclusion that i would just take the chance and see how it behaves.

I've used this product: https://www.easycomposites.eu/xencas...-casting-resin

Under the "Product questions" they do mention yellowing from UV exposure. I've tinted the PU black which will make yellowing much less noticable. Of course there's longer term degradation not only from UV but also ozone. If it happens quicker than i expect I will re-evaluate. I have a mold and can cast new ones.

Do you have any inputs on stabilizing agents? I'm all for learning
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Opel Kadett c Coupé build thread:
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  #28  
Old 07-31-2022, 06:37 AM
Marc Bourget Marc Bourget is offline
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Jaro said: "Marc, I know, I use industrial polyurethane. After some time it degrades and changes color."


I suspected that, the comment was intended to provide general knowledge to those with little or no exposure to this "area" of activity.


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  #29  
Old 07-31-2022, 06:53 AM
Larry4406 Larry4406 is offline
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Really nice job on the bumper horns!


Can you explain how you did the mold, pour, and used your vacuum chamber to degas?


Details also please on the vacuum chamber. Home made or purchased?
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  #30  
Old 08-01-2022, 01:49 AM
Antoine_P Antoine_P is offline
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From great metal work to fiberglass and moulding skills, this thread is only getting better and better! Thanks for sharing!
Antoine
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Resurrecting a 60 ghia:
http://www.allmetalshaping.com/showthread.php?t=18852

Fixing a 914:
https://allmetalshaping.com/showthread.php?t=20624
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