What is the adhesive spec. for this label?

The Weatherproof Polyester for Laser has a permanent acrylic-based adhesive. The minimum application temperature is 25° F and once applied it can withstand temperatures from -40° F to 302° F. If you need any other material or adhesive specifications, you can visit the link below or reach out to our Customer Support Team at 888-575-2235. https://www.onlinelabels.com/material_polyester_laser_labels.htm

Does the adhesive on these labels have a shelf-life?

Our labels usually have a shelf life of 1-3 years depending on environmental and storage conditions such as heat and humidity. We recommend keeping the sheets in the plastic clam shell in which they are shipped, in a climate controlled room with low humidity. If you would like to test whether or not this item will work for you, you are welcome to use the link provided below to request free blank sample sheets. https://www.onlinelabels.com/samples

I'm looking for labels that are 0.5" by 3" can these labels be written on I don't want to use a printer can I just write on them with ink pen or sharpie

The Removable White Matte (WR) is an uncoated paper-based label material intended for inkjet or laser printing. However, you can write on the material with a variety of writing utensils. Below is a link with a list of our materials and the utensils we've tested with. https://www.onlinelabels.com/support/faq/118?categoryId=15

Are any of the colored labels weatherproof?

Our colored materials, including True Blue (TB), are uncoated, paper-based materials so they aren't recommended for use with wet applications. If you need something weatherproof, we do offer a variety of options here: https://www.onlinelabels.com/materials/weatherproof-labels