They don’t ship it with 8×10 borderless printing, so the workaround is to fool it by telling Photoshop you have 8.5 x 11 borderless and then printing as if it was 8×10…

Have you tried this:

1) Creat a 13×19 white (or transparent) document of appropriate color depth and resolution in your image editor

2) Select, copy and paste your 8×10 image into the 13×19 document, and align the image to the upper left-hand corner of the document

3) Load your i9900 printer with your 8×10 paper

3) Instruct your image editor / Canon i9900 printer driver to print the borderless 13×19 document with your preferred paper type and image quality settings (whatever you’ve determined is optimal for this stock)