Often after printing and flashing the back of a shirt, you may be able to use the coating stroke for the front left chest.
Compare the front print to the back and see if it appears to have an acceptably opaque print. If so, no need to flash. This can be a huge time saver especially if the order is for several hundred shirts.
It is important to note that not all ink brands work equally well for the coating stroke technique. It will require a certain amount of trial and error and experimentation to see what works best. Moreover, lower mesh counts in the range of 140 mesh and lower will usually produce the best results as it is necessary to be able to drive a decent amount of ink through the screen.
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This article is written with the manual t-shirt printer in mind and the technique is for single color printing only.
As a screen printer, are you familiar with the coating stroke? It is sometimes possible to eliminate flash curing on certain dark shirt orders. Think of how much time you can save if this technique will work for the job you may be printing.
The mastery of an effective "coating" stroke may take some practice and will not work with all inks and every type of artwork or mesh count.
But if you are able to use it on the job you are printing it could save you valuable time.