good quality but a challenge

Sticker Mule was easy to use, and I'm very happy with the look of my stickers. My only issue is that the material of which the sticker is made doesn't easily allow me to write on it without any marker or pen I've found to smear. My order was for signature/authentication stickers for the backs of my original fine art paintings, so I have a need to fill out the title of the painting and then add my signature. Other than that, I'm very happy with the product.