Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Hi Michael,

On Sat, Dec 17, 2011 at 2:54 PM, Michael <Patriot121@...> wrote:
>
>
> Any luck Larry?


I've had a couple people contact me about purchasing the dry-film
resist that I currently have for sale but only one for the AQ3000
liquid photoresist. Until we can get together around 20 people for
group buy on the AQ3000 it just isn't realistic. I certainly don't
want 20 kg of resist all to my self :-) It's too bad because it
seemed like a lot less hassle to coat up a bunch of boards with it
since I would spray it on with an airbrush while spinning, then set it
aside it dry. Total time invested per board, about a minute or two.
The dry-film resist is more time intensive since you really need to
spray the board down with water to allow repositioning and bubble
elimination after you take the time to cut the resist down to size,
remove the cover sheet, and then run through the laminator once or
twice, depending on the temperature you use. Higher temperatures
allow a single pass but risk producing bubbles. The resist is 12
inches wide so it's unlikely that you'll be coating any boards that
actually match up in width and thus only require a single trim of the
resist to fit.

At any rate I am selling the dry-film resist for $1.60 a foot with a
minimum order of 5 feet, plus $7 shipping which covers postage and a
cardboard shipping tube. As mentioned the resist is a foot wide so
it's a fair amount for the money.

Regards,
Larry


>
>
>
> --- In Homebrew_PCBs@yahoogroups.com, Larry Battraw <lbattraw@...> wrote:
> >
> > On Wed, Oct 12, 2011 at 12:32 PM, designer_craig <cs6061@...> wrote:
> > >
> > >
> > >
> > > Larry
> > > I got some AQ3000 in Feb of 2010. Genesis had it in quarts on Ebay and I paid about $81 with shipping. You may want to call them and see if they would put a quart up on Ebay buy it now.
> > >
> > > At the time I attempted to sell part the quart in 4oz qty for my cost plus shipping -- got no takers.
> >
> > I contacted them last week about this but they refuse to sell quart
> > sizes at all since apparently they're concerned about shelf life.
> > They require a commitment for a certain amount to be used over a
> > period of time (Likely a large amount) to deal with you.  It was very
> > discouraging, going from a great eBay-based model to a proprietary,
> > difficult to work with process that marginalizes all but the larger
> > users.
> >
> >
> > > I talked with one of the engineers at Genesis about the 6 month shelf life and he told me it was much better than that but for commercial uses had it set at 6 months. He wouldn't say how long it would last but I keep it in the refrigerator like I did the Shipley AZ111 I used years ago. It was still good after 10 years. I haven't used the AQ3000 lately, guess I should test it one of these days.
> >
> >
> > As far as shelf life goes I may have been fine with mine which was a
> > couple years old except for the fact it got frozen in my refrigerator
> > by accident.  It caused the solids in the solution to separate into a
> > block of blue gummy stuff and watery blue liquid.  I really wish I had
> > some more but I'm afraid that without a group buy-in it's not
> > possible.
> >
> > >
> > > I spin coat it on boards then bake at 180F till hard. Use potassium or sodium carbonate to deveolope. I did find I needed to thin it a little with water to get a better spin coat. It's fairly sensitive and Zoltan was able to immage it with his direct UV laser writer with stunning resolution.
> > >
> > > Just too many projects and not enought time or money.
> > >
> > > Craig
> >
> > I used to spin-coat it as well and it worked perfectly most of the
> > time. Thinning it was definitely a necessity to avoid having it too
> > thick in places.
> >
> >
> > Regards,
> > Larry
> >
>
>