International Coatings 900 Series Catalyst sould be added to the 900 series inks to promote better adhesion to nylon.
The 900 Catalyst comes in 2 oz. and 8 oz. containers and should be hand stirred into the ink to the following proportions:
By volume = 16 parts ink to 1 part catalyst
By weight = 20 parts ink to 1 part catalyst
1 oz. Catalyst to 1 pint of ink
2 oz. Catalyst to 1 quart of ink
8 oz. Catalyst to 1 gallon of ink
Ink may be used immediately after mixing. Do not mix more ink than is needed for a job. Do not under catalyze the ink. Pot life of ink mixesd with catalyst is 4 to 8 hours. Over catalyzation will shorten pot life of ink. The catalyst creates a chemical bond to adhere the ink to the nylon fibers.
Alternative uses for 900 catalyst:
A catalyst can be added to flock adhesive to promote better adhesion of the flocking fibers.
A catalyst combined with (black) ink (for black fabrics, for example), reduces the appearance of fibrillation, especially after the garment has been washed.
Adding catalyst can improve adhesion on most other fabrics, not just nylon.
A catalyst can also improve adhesion to leather or vinyl substrates, but it is crucial to test that the substrate can withstand the 320 degree F cure temperatures required to cure the ink.
Just remember that once a catalyst is mixed in with the ink, the ink has a pot life of about four to eight hours, so be sure to only mix enough ink to use for the job.