If you've every tried to apply heat transfer vinyl to a onesie you know there can be challenges for getting a good stick. Those using an iron actually have an easier time getting the HTV to melt into the fabric than heat press users because the iron has a smaller surface area.
The problem for heat press users is caused by all those overlapping areas, thick neck seams, and snaps which prevent the top plate from getting a tight seal on the front of the onesie.
I keep a piece of cotton material, folded over several times, handy and place it inside every onesie before I apply the HTV.
The edge of the fabric should start right below the neck seam. This puffs up the chest-area of the onesie so it's more even with the thick seams thus making a more even surface for the heat press top plate to close on.
Either way you do it - the heat press will now get a better seal and provide more pressure so the HTV will really melt into the fabric.
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