Homebrew_PCBs

On Tue, Feb 25, 2014 at 11:01 AM, <javierete@...> wrote:


Hi ctech


Your boards have very good finish, keep us posted!


How do you dilute the mask paint? And what about the silkscreen? BTW I
think you didn't finish the tutorial so I'll stay tuned on your webpage.


Regards!




[Non-text portions of this message have been removed]

 

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.

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.



[Non-text portions of this message have been removed]

>
>
> Well, I tried diluting and airbrushing some of the ink (white) but didn't have
> any success.
>
> Well, it dilutes ok. It airbrushes fine to a thin coating. And I "baked" it in
> the oven at 180 degrees C for about 20 minutes and it "dried" ok, soft but
> tack-free. Then I tried to cure it under the UV.
>
> But... it doesn't seem to cure under the UV at all, something is inhibiting it

>
>
> Expose it in direct sunlight (it has a *lot* of UV). If it works,
> maybe your UV
> source is no good
>

>
> (105-115deg it starts to cure, higher and it's all crap) when the
> color tone changes slightly its junk
>

>
> Also I just dry the pain enough to apply the mask, it is a little bit
> sticky but the mask can be moved a little bit, and the paint does
> stick a little to the mask after curing so masks are one time use only.

On Mon, Feb 24, 2014 at 5:49 PM, ctech <ctech4285@...> wrote:

here we go
http://nicadrone.com/index.php?id_cms=24&controller=cms

Seems to me like a good post for HackADay !

FC
--
During times of Universal Deceit, telling the truth becomes a revolutionary act
- George Orwell

> I will try curing an alcohol diluted sample today as I normally would
> under cellophane without baking and see if it can still be cured or if
> it is the changes induced by the alcohol thinning which causes the
> problem.