I did some testing on some sticker materials. I tested matte paper, clear glossy, and matte paper laminated with clear glossy adhesive laminate. I test them for writability with pen and pencil and with water.
In the photo below, I have tried writing on the stickers with both pen and pencil.
All of the sticker materials could be written on with pen.
The pen markings on the matte paper, clear glossy, and clear matte sticker paper were stable when I rubbed over them with my finger.
The laminated paper however, smeared easily when rubbed. I would not recommend writing at all on the laminated paper.
The matte paper and clear matte sticker paper were the only ones that could be written on with pencil. The pencil markings did not smudge when rubbed.
Next I tried rubbing the sticker materials with a damp kleenex. I also wet the paper the stickers were on right next to each sticker.
The pen and pencil did not run on the matte paper. The image itself did not run, but there is a slight water stain that remained after the water dried.
The printed images on the clear glossy and clear matte sticker papers completely wiped off where they were rubbed with a damp kleenex. They are definitely damaged by water.
The damp kleenex did not affect the printed image at all on the laminated paper sticker, although it rubbed off written pen on the surface of the laminate. I tried wetting the cardstock next to the laminated sticker, and the sticker still was not affected. The laminated sticker seems to be fairly waterproof.
For the last test, I adhered a laminated paper sticker to the lid of a small plastic box and took it to the sink, and ran water over it. It still looked unaffected.
Then I rubbed some liquid soap on the box lid and washed it off, rubbing lightly with my hand. This time I saw water had seeped onto the edges of the matte paper under the laminate. The paper dried and appeared undamaged, but the sticker image ink bled very slightly around the edges of the sticker. The laminated paper sticker should not be attached to objects that will be washed.
The sticker testings showed some of the uses the stickers were suitable for and some of the uses that weren't ideal for them.