Photoresist is a 12 inches wide, .002 thick negative acting.(Datasheet)
Send an email to damonb at pcbhobbyist dot com
if you are interested.
A brief demonstration of laminating the photoresist to a printed circuit
board can be seen here.
A demonstration of exposing and developing photoresist is here.
Some boards I have built using toner transfer is here.
FAQ
0. Safety
Just a few comments about safety. Making printed circuit boards is not that difficult, but you need to work safely. When handling acids and bases, be sure to wear safety glasses and rubber gloves. When working with a UV light source, be sure to protect your eyes when it is turned on. If you are not sure , then stop and find the answer before continuing.
1. How do I expose the photoresist?
Expose the photoresist to a UV light source. This can be sun light or a fluorescent light. With a fluorescent light, it can take up to 30 minutes. Also the quality will not be that great because the light is not directional. Using UV fluorescents with reflectors or UV LEDs in the 400nm range will work faster and give better results. Another suggestion is to use a 500W halogen lamp with the glass cover removed.
2. How do I develop the photoresist?
The developer generally recommended is sodium carbonate. You can find it in a grocery store with the name washing soda. You can also find it in a pool supply companies and is referred to as alkalinity increaser. Be sure what you get is sodium carbonate and not sodium hydrogen carbonate. That is baking soda. Good for acid spills and baking cakes, but not for developing resist.
If you do not have a store that stocks washing soda or a pool supply that has sodium carbonate, one suggested source is www.artcraftchemical.com
3. How do I remove the remaining resist after etching my board?
The remaining resist can be removed with sodium hydroxide. This can be found in stores under the name Drano. You probably want to get the dry type and not one of the liquid types. Other off the shelf sources mentioned include Rooto 100% lye and Red Devil Lye.
4. Where can I learn more about photoresist and making printed circuit boards?
thinktink.com has lots of information on creating circuit boards.
Another good source is the Yahoo group HomeBrew PCB. This group has lots of information and discussion devoted to the creation of homemade printed circuit boards. In addition to photoresist, other printed circuit board production techniques are discussed.
5. What software can I use for producing PCB artwork?
There are several options available. For basic artwork It can be as simple as using any number for free or commercial 2D CAD programs. For more electronic design automation(EDA) features, options include Eagle from CadSoft and GEDA. The more fully featured EDA tools combine schematic editing, simulation and board layout options.
6. How do I print the artwork.
There are several techniques that people have tried. Generally you will print to some kind of transparency. Generally laser printers and inkjet printers have been used. Manual methods such as tape or a permanent marker can be used for producing the mask. Results can vary and you will need to experiment. Groups like the Homebrew_PCBs can be invaluable as you try to figure out the process that works for you.