Backs not good for marketing

I like the quality of the sticker itself, it's the waxy back that I don't like and find VERY valuable. I use these as promotional items. I do giveaways, contests and hand them out on the street to help send traffic to my personal site and my society6.com page. I use a self inking stamp to add my details to the back of the stickers. When I started stamping, and stacking, then counting I noticed that there were ink marks on the front of the stickers. I turned them around and saw that the backs were smeared, some unreadable. I let them sit for 4 days and the backs still smear. I decided to slap some clear tape on the ones that were salvageable. The look does not make for a good first impression. I only stamped 100 out of the 150 I bought. Great. I will go back to a competitor that doesn't have that problem. I only used sticker mule because a friend recommended and I had a sweet promo code. It wasn't worth the headache and sloppiness of these.