The following process was developed by Nik Semenoff, Saskatoon, and is used with permission. The process allows for quick print drying and easy cleanup, ideal for school use.
Preparation Procedure
Ingredients
Dynamic #210 Heavy Duty Wallcovering Adhesive
Scola Cell cellulose adhesive (methyl cellulose)
Industrial Tinting Colours (ethylene glycol base)
Preparation of Ingredients
This will need to be premixed. Dissolve ½ package of Scola Cell Cellulose adhesive in four litres of cold water and allow the solution to sit for 24 hours. The result should be a solution with the consistency of heavy pancake syrup. If the mixture is too thick, thin with cold water.
In a plastic container add 50g of Scola to 500g of the wall covering adhesive. Make small batches of the paste mixture to insure that the product is fresh and produces a better "tackiness".
Purchase one litre cans of tinting colour used by paint stores to colour house paint. Although the tints are expensive they will last a long time as only small quantities are used. Small quantities of tinting colour can be kept in plastic squeeze bottles and used one drop at a time. Ethylene glycol based colours can be used with both water-based and oil-based colours.
Mixing of Ingredients to Create Screen Ink
The proportions are approximate and may be adjusted to achieve the consistency desired.
Add one part methyl cellulose solution to nine parts wall covering adhesive solution. The methyl cellulose solution attenuates the tackiness of the ink base and controls flow. If the ink is too tacky add methyl cellulose solution; if it is too runny add wall covering adhesive solution.
Add tinting colour to achieve desired hue. Very little colour is required for transparent hues. Start with very little and add drops until the desired colour is achieved. The tinting colours will produce transparent colours, if a more opaque shade is needed add white or black to the tinting base.
Printing
Print as you would with other inks. These inks dry very fast so you need to backfill the mesh each time. If the mesh blocks up, scrub the blocked areas with a squeegee or a fingertip until the blocked area opens and the stencil prints cleanly.
Clean-up
Use cool water and a hand spray to clean-up. Even dried ink will dissolve and flush out of the screen mesh.