I have noticed some of the white ink shirts I print seems to last longer than others but I cure them both the same way and they seem cured and stretch with the fabric. It just some seem to have place where the ink has came off in certain spots like when I flashed them they might have cured to much but it is only in spots is this because the ink might have been to thin there and cured than the other areas where it was thicker? I figure it is a curing problem but it only seems to happen every 2 out of 10 orders and only like 3 shirts out of the order might have a problem my customers don't mind but it upsets me.
Thanks for any help.

Yes, that is most likely a curing issue. But probably not an over cure rather an under cure. What are you using to cure the shirts and how?

I’m guessing you’re using a flash cure unit or a heat gun.

I'm flashing them and then running them through a belt dryer. The flash unit kind of old it the type without any knobs.

Could this be an ink issue? Would using the wrong type of ink (poly ink on cotton or vice versa) cause these kind of problems?

I don't think so I'm printing on 100% cotton. Now it is true that my old white ink was really thick so I had to stroke the screen about three times to get a good print. I switched ink and trying it out now to see if that was the problem but just in cast it now I kind of wanted an idea of where to look next. Thanks

Well if you’re sure it’s not an under cure, which in most cases it is, then I would look at the ink. A better, higher quality ink may solve the issue entirely.

And Greg, you can use polyester inks on 100% cotton FYI. It will bond jsut fine and should behave the same as a standard plastisol ink.

Actually I think your right I just thought it was over curing not under because I read somewhere that if you flash it to long it can cause the next layer of ink to come off and I though that was what was going wrong. But I will try curing longer and see what happens.