How to Iron on Patches on Polyester
If you don’t want the polyester to catch fire and be ruined then you can take a few precautionary steps. These will most definitely save you some trouble.
First of all, start by setting your iron to low heat. This will ensure that the polyester doesn’t get ruined by the high temperature itself, plus it’s harder to generate fire this way. Make sure that you don’t use steam either, as you will just get everything wet and the low heat won’t be able to do much with it.
Then grab a piece of parchment paper or a thin material (we highly suggest cotton in this case). It should be big enough to cover the whole patch, so you don’t need to move it around. If you decide to skip this then there will be a ton of extra heat on the polyester and it will catch fire much more easily.
Make sure that you only have one layer of polyester below the patch, as it’s such a delicate and thin material that the glue can flow to the other side. If you don’t watch out then you will stick the back and the front of a piece of clothing together. And unfortunately, there’s no undoing that.