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Silver Spray On Instead of Alumnimizing?

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#1 saemark30

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Posted 22 October 2013 - 02:26 PM

Anyone come across a silvering method that can be sprayed out?
I see it is been used on the 70" scope thread but never heard of such a product.

#2 Ed Jones

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Posted 22 October 2013 - 02:48 PM

Sure chemical silvering can be done with a 2 part spray gun. Peacock Chemicals has or had such a silvering kit.

#3 sopticals

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Posted 22 October 2013 - 11:19 PM

Spray on my silver using weed spray gun. Angel Gilding for the chemicals. Easy to do, and inexpensive.

Stephen.(45deg.S.)

#4 John Carruthers

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Posted 23 October 2013 - 05:32 AM

domestic mirrors are sprayed but they are 'back' mirrors, the quality of the surface isn't as critical as a first surface mirror.

Getting the right thickness of deposit to provide reflection, but without distorting the figure would be tricky. I believe the thickness needs to be in the order of 3 or 4 molecules? (ISTBC).

#5 saemark30

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Posted 23 October 2013 - 11:12 AM

Spray on my silver using weed spray gun. Angel Gilding for the chemicals. Easy to do, and inexpensive.

Stephen.(45deg.S.)

Thanks for the tip. It looks like the spray silver concentrate 120mL plus spray silver activator 500mL and spray silver reducer can be gotten for less than $100.
This covers 133 sq ft. Very reasonable for large quantity of small mirrors or a even a few 1m size mirrors.

#6 Qwickdraw

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Posted 23 October 2013 - 11:22 AM

Note to self, don't buy mirrors from Saemark :grin:

#7 BigC

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Posted 23 October 2013 - 11:29 AM

LOL!!

#8 saemark30

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Posted 23 October 2013 - 11:33 AM

OK I'm keeping my next 70" mirror for myself!

#9 kfrederick

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Posted 23 October 2013 - 12:20 PM

Sasmark have a link for the silver supplies I have some big mirrors that need coated .

#10 Chuck Hards

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Posted 23 October 2013 - 12:24 PM

Get enough to practice on scrap glass first. 70-inch Mike told me that he had to practice a bit before he nailed his technique.

#11 highfnum

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Posted 23 October 2013 - 02:53 PM

this is crazyist thing I heard of
I like to see a photo of an example

#12 careysub

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Posted 23 October 2013 - 03:05 PM

Get enough to practice on scrap glass first. 70-inch Mike told me that he had to practice a bit before he nailed his technique.


Wouldn't you want to practice on a good test mirror (you can strip and recoat repeatedly) so that you verify the coating is performing optically?

#13 DAVIDG

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Posted 23 October 2013 - 03:19 PM

The chemist is exactly the same as what one does when they silver solution coat a mirror in a bath. As Ed stated Peacocks labs has been selling the material for many years http://www.peacockla...om/products.htm At one time they sold the solutions packaged in typical spray paint type cans

- Dave

#14 saemark30

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Posted 23 October 2013 - 04:55 PM

http://angelgilding....praySilver.html

Why not?

#15 sopticals

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Posted 23 October 2013 - 06:27 PM

http://angelgilding....praySilver.html

Why not?


Go for it. My mirror works :grin: fine. Fantastic DSO views with 95% :roflmao: reflectivity.

Stephen.(45deg.S.)

#16 ccaissie

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Posted 23 October 2013 - 07:22 PM

If one desires a semi reflective coating, say in testing an optic in progress...Ritchey Common test or back surface of mangin, etc., can this process give a uniform reflective surface? Can it be readily controlled to do 50% reflectance, etc?

Does anyone know what standard silvering technique this is similar to?

Rochelle Salts? Brashear?

#17 kfrederick

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Posted 23 October 2013 - 07:42 PM

Our 7inch secondary was overcooked and needed re worked in getting coated / so some risk in coating and on a 36 $$ Just the thought of UPS having the glass Ouch

#18 saemark30

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Posted 24 October 2013 - 01:08 PM

Perhaps there is a spray on antireflection coating as well, that would be really crazy!

#19 DAVIDG

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Posted 24 October 2013 - 03:21 PM

Perhaps there is a spray on antireflection coating as well, that would be really crazy!


Most AR coating needs to be applied in very precise thickness to work but there are chemical means to "stain" the top layer of the glass and form an anti-reflective coating. Certain glasses can be dipped in acid which removes some of the metal ions on the surface forming an antireflective coating only a few atoms thick
by changing the refractive index of the top surface.

- Dave

#20 highfnum

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Posted 25 October 2013 - 04:12 AM

Wild learn something new every day

#21 Startraffic

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Posted 25 October 2013 - 05:10 PM

LOL, for a second I had pictures of spraying a mirror with the stuff they spray on house trailers. I did that with a roller once....once. :foreheadslap:

Clear Dark Skies
Startraffic
39.138274 -77.168898

#22 Lynnblac

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Posted 25 October 2013 - 05:37 PM

Up until the 1930s all telescope mirror were coated this way. The 100" Hooker telescope that Hubble used to discover the scale of the universe was silvered.

#23 richard7

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Posted 25 October 2013 - 06:46 PM

This is getting to be a very interesting thread.

#24 highfnum

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Posted 26 October 2013 - 08:16 AM

I thought mirrors were placed in tub with silver
Solution then after x time taken out

Sprayon seems to crude but what the hell do iknow
Next someone will say youcan use a 5 buck home depot brush

#25 highfnum

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Posted 26 October 2013 - 08:19 AM

I still would like to see photo of one
Butif davidg says its valid it most likely is


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