Is RL2104 compatible with QL 800 and Dymo 450 label Printers?

The RL2104DT is not compatible with DYMO or Brother printers. However, we do offer DYMO compatible products at the link below. https://www.onlinelabels.com/comparable/dy-labels

Are these labels able to be printed on when using Wax-Resin Printing Ribbons?

For the Weatherproof Thermal Transfer (TW) material we recommend using a Durable Wax Resin ribbon. These are ideal for synthetic materials like the polyester-based weatherproof option. Our Resin-Enhanced Wax ribbons are recommended for the paper-based materials like our Standard White Thermal Transfer. You can review our available ribbon options at the link below. https://www.onlinelabels.com/thermal-ribbons.htm

Is this RL2104DT - self adhesive labels ?

Yes, our roll labels offer adhesive on the backside. The Standard White Direct Thermal (DT) offers a permanent adhesive that works well for most applications. If you'd like to sample the material, you're welcome to visit the link below: https://www.onlinelabels.com/samples