My iron has a steam control and temperature setting. Seeing this, I assumed that while I wasn't planning on using steam, it was probably a good indication of where to put the iron. I set the regulator to about 20% above the minimum vapor setting. When everything worked, I decided to take the temperature. At this setting, the iron appears to hold a temperature of around 400 degrees Fahrenheit (the temperature of the iron's surface). I enlarged the patch and placed a second smaller piece on the opposite side covering the actual hole in the fabric. It worked very well. I couldn't cover the entire area well with the iron while keeping the patch perfectly flat, so I kept moving the iron while heating the patch. Looking back, I think it's a good idea to keep the irons moving. When I thought I was done there was an area on the patch that showed less of the color of the original material. This material is quite thin so unlike, say, a denim patch, the underlying material shows through when there is a color contrast (thin but seems strong). The bag I repaired was black and you could clearly see the difference between the area where everything was at the right temperature for a sufficient amount of time and the area where it wasn't. The area that was not heated long enough still looked like the original patch material (the original black material did not show through). I worked this area with the tip of an iron until it was identical to the rest of the patch. It doesn't become transparent, but that's the only way I can describe it. When it looks like this, it looks like it was glued well. If it still looks like the original patch material, you need to heat it longer. There was one review that gave it a very bad rating. I suspect that their hardware may have been set too high. Didn't see this review before starting but was concerned that the glue might overheat. After reading this review I thought it would be a good idea to find a temp that works for me. Once you've done this there will be visual feedback, but you won't know it unless you even do it. I used an automotive or HVAC infrared pyrometer (non-contact temperature sensor) to measure the temperature. Hope this helps others.
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