Why is the ink cracking when I do a stretch test?Updated 7 hours ago

First off, a stretch test isn’t a complete test for whether or not the ink is fully cured. It can show whether the surface of the ink has fused enough to stretch without immediately cracking, but it doesn’t tell you how well the entire ink layer has cured. You should always perform a wash test as well to confirm the ink is properly cured and holding up through a wash.

If you notice the ink cracking, the first step is to determine whether you're seeing ink splitting or under cured ink.

Ink splitting occurs when the ink layer is too thin or doesn't have enough support from the garment underneath it. The cracks will typically appear in the same areas and may follow the weave or texture of the garment.

Under cured ink tends to produce more of a shattered or fragmented pattern. If you gently tug on the ink deposit once it's cooled and it begins to “shatter” or break apart, that can be an indication that the ink hasn't fully cured.

Keep in mind that some garments have more stretch than others and can put more stress on the ink. In these cases, applying a thicker ink deposit can help the print withstand the additional stretch. A stretch additive may also help improve the ink's flexibility. Both of these may require further adjustments to your cure time.