How well would an iron-on patch?

Personally, I've never had much luck with iron-on patches. You can try it, but I would run a seam around the outer edge of both of them.

it could work but it may start to rise up after washing and drying use fabric glue as well

you can always buy a piece of fabric to cover the hole in the fabric and use fabric glue to put that on

Ironing two together is going to be very bulky and depending on where it is placed can irritate the skin. I would us an applique or purchase some fabric to fix the item.

Might work if the patches are thin and smooth. I would use E6000 Fabric Fuse adhesive along the edges. Then iron them.

It should work rather well depending on how much wear will be put on the patch area. Years ago before torn knees on jeans was fashionable, I often patched my children's jeans' knees with iron patches. If they didn't work well, I then sewed a line of stitching around the perimeter of the patch.

I usually add some fabric glue to it around the edges after I iron it on to secure it more.

It might work though you should test it out first using similar fabric and patches. Make sure to wash the test piece and run it through some paces to see.

Hi Mark, it won't last, you are better off to iron on then stitch it either by hand or machine to make sure it stays in place.

If you are trying to put two iron-on patches against each other in a place on a garment that bends or on fabric that stretches, the double patch scheme will not hold.

For me the best way to make sure an iron on patch adheres well is to stitch around the outside of the patch. Just seems to make it more secure.