Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "twb8899" <twb8899@...> wrote:
>
> Check out this ebay auction:  300065847043
> 
> I had a very interesting telephone conversation today with Steve
> Johnson who owns the company that makes this photoresist. Steve is
> just getting this product off the ground after many years of research.
> A water based photoresist is something the circuit board industry has
> been waiting on for years. He said it was the only water based product
> of this type on the market.
> 
> There are NO solvents or VOC's in this product. Steve told me it has a
> slight water based (latex) paint odor. This would be great for anyone
> with a home based shop who doesn't want to put up with the stink of
> dry film or solvent based products. It can be processed the same as
> dry film resist after it dries. 
> 
> Development would be in a weak sodium carbonate (soda ash) solution.
> Washing soda from the grocery store is soda ash. Make a 1% solution
> with water. Approximately 1.25 ounces of the dry soda ash powder to
> one gallon of warm water should work fine.
> 
> Sodium hydroxide (lye) can be used to strip this resist after etching.
> A 1 or 2% solution should work for stripping.
> 
> I plan on using this resist for photo engraving stainless steel sheets
> for a product I make. Steve said this material has better adhesion
> properties than dry film. Resist adhesion has always been a problem
> for me when processing stainless steel. I will use it for my circuit
> board production as well. My plan is to use a simple dip coater for
> applying the resist and drying it with an infra red heater panel.
> 
> Something else to consider, this company also makes soldermask and
> component legend products that exhibit the same fast exposure
> properties. I have used liquid photo imaged soldermask for years and
> if you don't have a high power exposure unit you aren't going to get
> the job done. Those products take lots of UV power for proper
> exposure. The way it looks, this new soldermask product will get a
> complete exposure with much less power. This is a HUGE bonus for the
> experimenter and home shop guys who don't have high power equipment.
> 
> I will be testing this product in my shop very soon and plan to post
> the results here. Hopefully others will do the same as I feel they
> will obtain some first class boards by doing so. 
> 
> Steve Johnson told me he would welcome orders from anyone so don't
> worry about being a hobbyist or home based shop. He wants to get this
> product out there and I applaud him for accepting orders from
> commercial and hobbyist users alike.
> 
> I am not affiliated in any way with this company and only learned
> about them today but I plan on being a regular customer and I hope
> others will try it too. 
> 
> Tom
>

hi, as you describe the resist its most like screenprining emulsion to me
is it a two part product ! (sensitizer)

i have it, but never tryet using it that way :) 

Gr Roel