Haven't pulled the trigger on my first attempt to make a pcb using the photo-resist method. Here is my setup.
Created the board layout in Eagle (free version) Purchased photo-resist from ebay - seems there is no information on the product I bought. Purchased positive developer from MG Chemical
My first attempt seemed to indicate that the layout transparency needs to be a negative image (traces clear and background black) Is there something I should have done to be able to use positive images?
I made a small exposure box using 180 UV LEDs and it seems to expose the film in about 10 minutes.
Is there a way to get Eagle to print negative images of the payout artwork?
What should I look for in photo-resist and developer if I want to develop from a positive image?
I've seen a few YouTube tutorials that show the exposed photo-resist being developed using sodium carbonate. Is that better or not as good as using MG Chemical positive developer or did I miss understand them entirely?
Is there something I should be using instead? Unfortunately there is so much info on YouTube and the web that is not consistent and hard to figure out who to listen too.