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Going to restore an antique Zeiss

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34 replies to this topic

#1 starman876

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Posted 16 March 2020 - 06:00 PM

Going to restore this antique Zeiss .  Deciding if I should  leave the paint as it is or strip it down and repaint it.   Any suggestions?  Figure I will be having lots of  time during the next 30 days or more.  I bought the special paint used on the antique zeiss scopes. 

 

travel.JPG


Edited by starman876, 16 March 2020 - 06:00 PM.

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#2 starman876

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Posted 16 March 2020 - 06:14 PM

I have not tried yet, but I am wondering if the current paint strippers will work on this old type of paint.  It is some sort of linseed oil paint.


Edited by starman876, 16 March 2020 - 06:17 PM.


#3 Bomber Bob

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Posted 16 March 2020 - 06:24 PM

IDK...  The paint on that 1956 Uni 152's brass tube came off in sheets with the spray-on stuff I used.  Whereas, JD had trouble removing the paint from the equally old Edmund 4's aluminum tube.  Maybe the metal underneath matters, too??



#4 starman876

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Posted 16 March 2020 - 06:36 PM

IDK...  The paint on that 1956 Uni 152's brass tube came off in sheets with the spray-on stuff I used.  Whereas, JD had trouble removing the paint from the equally old Edmund 4's aluminum tube.  Maybe the metal underneath matters, too??

Maybe that Brass Unitron was powder coated.   Different types of metal require different types of primer for the paint to stick to.


Edited by starman876, 16 March 2020 - 06:37 PM.


#5 G-Tower

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Posted 16 March 2020 - 06:41 PM

That's a tough choice. There's something unique, mysterious, and mesmerizing about an untouched Zeiss patina and all.


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#6 starman876

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Posted 16 March 2020 - 06:54 PM

That's a tough choice. There's something unique, mysterious, and mesmerizing about an untouched Zeiss patina and all.

not sure if you can call this patina.  Paint flacking off a metal tube.


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#7 Kasmos

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Posted 16 March 2020 - 07:26 PM

For what it's worth:

I recently bought and used some Jasco paint stripper and it's been reformulated. The old formula worked very fast with a paint bubbling effect that was easy to scrape or remove with steel wool and it would dry if left on a surface for a short time. The new so-called safer formula turns into a sloppy goo that will not dry for days. Although the former product was probably considered more harmful to one's health,  the replacement product smells much worse and gave me a headache. I never had an issue with the old stuff, so I'm bummed that it no longer sold and I'll never use the new formula again.

 

In the future I'll probably have to use something like Citrus Strip but I'm not sure how good or quickly it works on oil based paints.



#8 starman876

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Posted 16 March 2020 - 07:31 PM

here is a close up of the dew shield 

 

zeiss dew.JPG

 

most of the paint is gone.  


Edited by starman876, 16 March 2020 - 07:31 PM.

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#9 starman876

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Posted 16 March 2020 - 07:33 PM

And this is the OTA paint flacking off

 

 

zeiss flacking.JPG

 

 

 


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#10 starman876

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Posted 16 March 2020 - 07:34 PM

I have figured out that all the hardware on the tripod is brass.   Wonder what that would look like all polished.



#11 rachnoman

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Posted 16 March 2020 - 08:04 PM

You might try contacting Texas Nautical Repair. They specialize in restoration and might be of help to you in what solvents they use.

 

Good luck.



#12 G-Tower

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Posted 16 March 2020 - 08:48 PM

You might try contacting Texas Nautical Repair. They specialize in restoration and might be of help to you in what solvents they use.

 

Good luck.

They wouldn't know where to start and if they did the price would be astronomical!!!


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#13 Carl N

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Posted 16 March 2020 - 08:57 PM

I'd start with Acetone, assuming you are completely disassembling all parts.

#14 rachnoman

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Posted 17 March 2020 - 12:48 AM

That's a good start.

A last option would be to use a wire brush (disk) with a variable speed hand held drill.



#15 Dan /schechter

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Posted 17 March 2020 - 12:58 AM

Going to restore this antique Zeiss .  Deciding if I should  leave the paint as it is or strip it down and repaint it.   Any suggestions?  Figure I will be having lots of  time during the next 30 days or more.  I bought the special paint used on the antique zeiss scopes. 

 

attachicon.giftravel.JPG

HI Johan,

I have a 80mm Zeiss tube that had so many layers of horrible paint and chips on it that I had no choice but to have the paint removed and new paint job. I took the tube to a body shop and they did a wonderful job. The white paint was a perfect match in color and texture. So, my advice to you is to take your ota to your local body shop and ask them what they would use to remove the old paint. You might want them to strip it for you if the fee is reasonable

 

Dan


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#16 starman876

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Posted 17 March 2020 - 08:25 AM

HI Johan,

I have a 80mm Zeiss tube that had so many layers of horrible paint and chips on it that I had no choice but to have the paint removed and new paint job. I took the tube to a body shop and they did a wonderful job. The white paint was a perfect match in color and texture. So, my advice to you is to take your ota to your local body shop and ask them what they would use to remove the old paint. You might want them to strip it for you if the fee is reasonable

 

Dan

Thanks Dan.  Good idea.  



#17 Kasmos

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Posted 17 March 2020 - 02:52 PM

A friend paints his own cars and motorcycles and uses a special paint removal wheel on his hand grinders that won't hurt the metal.

I mention it since some automotive body shops might use a rough grinder or a sand blaster to remove the paint.


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#18 Bomber Bob

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Posted 17 March 2020 - 05:59 PM

A friend paints his own cars and motorcycles and uses a special paint removal wheel on his hand grinders that won't hurt the metal.

I mention it since some automotive body shops might use a rough grinder or a sand blaster to remove the paint.

Great point.  JD's removal tools are suited to his son's steel-frame gym equipment, which is another reason he used chemical stripper on the Dakin 4 & Edmund 4 before powder-coating these tubes.



#19 starman876

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Posted 19 March 2020 - 07:29 PM

stripped the paint on the OTA today and started polishing the focuser. 

 

zeiss stripped.JPG

 

 


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#20 starman876

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Posted 19 March 2020 - 07:37 PM

focuser polished, but more work needs to be done

 

zeiss focus 20.JPG


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#21 starman876

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Posted 19 March 2020 - 07:41 PM

I found the OTA had two coats of paint.  Which I had suspected.  Aircraft stripper took off the second coat but would not take off the first coat. Lucky it was old and brittle and scraped off rather easily.   The front cell that holds the lens cell will not come off.  I tried everything.  PB blaster, heat, carb spray, acetone and all the torque strap wrenches could supply.   I think the metal OTA and the brass cell have cold welded over the more than 100 years they have been on contacted with each other. 



#22 clamchip

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Posted 19 March 2020 - 08:22 PM

It looks like the tube is aluminum? very advanced for the time, or steel? a magnet will tell.

 

Robert


Edited by clamchip, 19 March 2020 - 08:26 PM.


#23 starman876

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Posted 19 March 2020 - 08:38 PM

It looks like the tube is aluminum? very advanced for the time, or steel? a magnet will tell.

 

Robert

It is steel.  



#24 Bomber Bob

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Posted 19 March 2020 - 09:59 PM

Looking Good, Johann.  That golden focuser is Da Bomb!!



#25 starman876

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Posted 20 March 2020 - 08:11 AM

Looking Good, Johann.  That golden focuser is Da Bomb!!

If only it was gold grin.gif 




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