Homebrew PCBs

http://ultradome.com/supplies.html
They sell a UV epoxy but it looks expensive to me. About 8 oz for $30 and 16 oz for $50.  

The question I have is what coverage per oz should one expect ?
Also this product is sold for doming and may be too thick.

Daniel Johnson


--- On Wed, 6/24/09, Steve <alienrelics@...> wrote:

From: Steve <alienrelics@...>
Subject: [Homebrew_PCBs] Re: DIY SolderMask
To: Homebrew_PCBs@yahoogroups.com
Date: Wednesday, June 24, 2009, 4:37 PM











    
            
            


      
      --- In Homebrew_PCBs@ yahoogroups. com, Simao Cardoso <simaocardoso@ ...> wrote:

>

> On Tue, 2009-06-16 at 09:20 -0400, Myc Holmes wrote:

> > It seems a bit expensive for some UV curable paint $15 for 1/3 of an

> > ounce,

> 

> 

> I could not stop thinking about from what is made that soldermask. So i

> asked the seller gently.

> 

> (my question)

> hi, i was looking for soldermask and... found yours! But, sorry for

> asking this, i am not convinced yet, soldermask are normally epoxy, and

> yours seems to behave different. If the powerful lamp heats the board

> all the epoxy will be cured. 

> Are this just part A epoxy (resin) with silkscreen sensiblizer? Or other

> type of ink with sensiblizer? I ask because i have to know how long it

> will last, if i can use it in various boards or if only has few days

> self live. The necessary conditions for storage (light, temp, humidity).

> Etc. Sorry if am asking to much. Very thanks, Simao



I think "sensitizer" is the word you are looking for?



> (answer)

> Hi, Yes you are correct, it is UV epoxy. The lamp is provide light

> energy and it is not advise you to bake or roast the PCB, only provide

> bright light, you also do it under sun light or just leave it for indoor

> lighting for 24hours. 

> This is not A+B epoxy.... so no need other type accelerator. ...

> No.. It can last for 1year. in provide you are not put it under strong

> light. It is better to put it in the drawer, complete dark storage area.

> Regards, Raymond

> 

> 

> 

> UV ink used in outdoors and plastics is not that thick, and is even more

> expensive. I still believes this is epoxy, but just part A (bisphenol

> resin) it's said can cure alone in UV. I might try it, and might even

> buy this (but epoxy glue is cheaper).



Don't confuse UV -cured- polymer with UV -resistant- outdoor ink. Nothing similar.



I'm sure it is UV cured polymer/acrylic. It has been in use in the electronics industry for a long time, and has been used in the gift industry to make stickers.



And I see now for fingernails and a lot of other things.



Steve Greenfield




 

      

    
    
	
	 
	
	








	


	
	


      

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