screen printing > Newbie

Is "over flashing" actually a thing?

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spencer_L&KC:
Like the title says, is over flashing actually something to be cautious of? Or is it a myth? Obviously leaving the shirt under the flash for extended times isnt great, but when it comes to making sure to keep a print tacky, how important is it really?

Has anyone here ever seen top colors not adhere to a base, and maybe even come off, not from under curing, but from flashing too long?

Has anyone here ever seen a second pass of white come off the first pass?

I have been printing since 2011, printing professionally since 2018. I have never once seen a top color or second pass of white detach from a base, and I know for sure that at some point I "over flashed" a print or two in that time. Still though, no issues with top coats adhering to the base. Another user on here mentioned in another thread that "over flashing" could be a myth, so I am very curious to hear what some of the other pros think on the subject. I am not a newbie, but posted here so actual newbies can find and learn from this thread. 

So what say you? Thanks for reading!

prozyan:
As far as ink failure on top colors, you'll ruin the shirt long before you see any issues there.

The only time over-flashing is an issue can be on some high polyester items, as excess heat exacerbates dye migration.  But that is easily solved with any decent ink.

mk162:
Yes, it's absolutely a thing.  Over flashing can lead to what look like white dots in your print. they only show up after the oven, or even when you pull your shirts.

tonypep:
Or when you melt an $85.00 blank. It happens. Total margin killer.

spencer_L&KC:

--- Quote from: mk162 on August 08, 2025, 08:43:09 AM ---Yes, it's absolutely a thing.  Over flashing can lead to what look like white dots in your print. they only show up after the oven, or even when you pull your shirts.

--- End quote ---

I always assumed that was fibrillation. How does over flashing create those bumps in the underbase? The conveyor gets hotter than the flash, so wouldn't simply running them through the dryer create those bumps if heat is the cause?

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