How long should I keep the iron on to get them to stick?

Put a plain cloth over them before ironing. I used high heat otherwise they may come off. Just read the instructions and once they are on, let them cool and then apply heat again.

My letters didn't come with instructions

Just make sure you have your iron hot enough and the Letters are heated thoroughly. I would iron them on the front of the fabric and then turn the fabric wrong side out and iron them on the back as well. Turn the fabric right side out and then iron them on the front again. If your iron is too hot, you might ruin the fabric, so be careful. The Letters are thick so the iron has to be hot enough to melt the glue on the other side of the Letters

Manufacturer	Juvale
Model Number	FXFUL
Package Dimensions	12 x 9.5 x 3.7 cm
Material	ポリエステル
Color	アルファベット。
Size	104 Pieces (4 Set)
Package Weight	0.05 Kilograms
Batteries Required	No
Batteries Included	No
Brand Name	Bright Creations

アイロン接着文字パッチ ジャケット、デニム、ファブリッククラフト、26アルファベット4セット (1インチスモール、104ピース)

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Common Questions

アイロン接着文字パッチジャケット、デニム、ファブリッククラフト、26アルファベット4セット (1インチスモール、104ピース)