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What causes ink to thicken and how can I avoid it?

Answer

Ink tends to thicken in colder temperatures or after sitting on the shelf for too long. Proper stirring of plastisol inks before printing is essential. The biggest culprit is usually white ink. White ink typically has a high pigment load, so as it settles it can become very hard to work with. 

Hand mix the ink or preferably use an ink turnabout to loosen up the ink before adding it to your screen. If you find it's still too thick, add some (5 to 10 percent by volume) curable reducer to help create a more workable viscosity. Be careful of adding too much as a reducer will also affect overall opacity if too much is added.

T&J Printing Supply