Specs:

resolution: 25 micron smallest dot size depending on the exposure and application
Exposure times: 30-120 seconds depending on light source
colour: blue
after exposure: blue
handling: under yellow light or in shaded room
shelf life unexposed: 2 years
negativ working photoresist ( unexposed parts will be removed during development )

Coating:
Clean the surface of the material that should be coated with resist. The surface ought to be dust and grease free. The easiest way of lamination for custom-made items is roller coating: Pour a small amount of photo resist on a clean glass plate and use a brayer to roll out a homogenous thin film of resist . Then transfer the resist to the surface of the plate You want to etch and cover it with a thin, even layer of resist . Dry with a hot air fan or in a drying oven for about 3 minutes untill all exhalable contents have gone and the surface becomes matte. After that the plate should be allowed to dry for at least one hour in darkness.

Exposure:
Given that the resist is negative acting, all parts that should be etched must be prevented from exposure so that the resist can be washed away in those areas during development. This is achieved by either paint directly on the surface of the resist with a black sharpie pen or by printing out a positive with an inkjet printer. For printing a positive a wide range of trasparencies is suitable. Best results can be achieved by using repro film for screenprinting. Printer driver settings are: Photo Glossy Paper and black/white to obtain an opaque transparency. If You don't have an exposure unit or vacuum frame, You should use a picture frame glass and a soft backing and press the transparency and laminated plate between to ensure tight contact between the positive (transparency) and the film surface .

Light sources can be everything that emmitts uv-light: terrarium lamps, work spot lights, exposure units and last but not least simply the sun. Exposing in the sun produces very precise and good results as long as the different exposure times are determined ( seasons, daytime )

Exposure time in Juli from 12 - 20 o'clock : 35 seconds

Development: 
Prepare a solution of 1 percent of developer and water ( e.g. 1 liter water + 10 gram developer ) in a tray  and put the plate into the developer. Leave it in there for at least 1 minute.  The unexposed parts are solved by the developer.  If all residue is removed, pull out the plate and rinse in cold tap water for about 1.5 minutes.

After development the photo resist has to be dried with a fan or hot air gun for about 2 minutes and then hardened under uv-light for 5 to 10 minutes.

The plate is now ready for etching.

After etching the plate the resist can be removed in a solution of 10 % developer in hot water or a 5 % solution of stripper in water.

          The coating is also soluble in alcohol or acetone.