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Subject: Re: [Homebrew_PCBs] RE: Home made double side PCB with solder mask and silk screen!

From: James <bitsyboffin@...>
Date: 2014-02-27

On 27/02/14 13:33, n0tt1@... wrote:
 

Just asking...that UV paint has a "short" shelf life, doesn't it?


Not that I'm aware of.  I have a couple 100g tubs of it kicking around, one has been here for well over a year and looks, smells, spreads, and cures the same as it always did.

That said, I have only really had good luck with some red stuff I got in 10cc lots, I probably had that kicking around for about 9 months before I ran out, and it worked just fine.  The white and blue I have large amounts of is quite hard to use, at least in the way I've been doing it (I've described here before).

I'm surprised that ctech got such good results.  Firstly, that he managed to dry it before UV curing. The only one I've seen that can be dried was the blue, the others don't really dry (before UV cure) at all, at least not air-dry, no matter how long you leave it.  Secondly that he thinned it with alcohol, I'm sure I tried that once and it didn't work.  Maybe it's the thinning and air-brushing that does the trick, perhaps such a thin coating will dry (at which point it would be MUCH easier to work with).

But certainly I think I will give it another go in the weekend, thin some out the same as ctech did and load it in my air brush to see if I can get the amazing results he did.