A watercolour painted on shiny card primed with absorbent ground

I coated a piece of shiny cereal packet card with several coats of absorbent ground to see if it would take watercolour paint well. I painted a view of Brownsea Island in Poole Harbour. I was able to create texture effects in the ground prior to paintng which was an interesting idea.

Here's the video

DIY Absorbent Ground

I decided I wanted to use my oil paints over a wax resist on paper that I could etch into, but how to protect the paper??? I needed a ground, but not acrylic gesso as its not absorbent enough and I also want to use that as a partial resist later on. Golden Absorbent Ground is expensive and I only want to experiment so I decided to make my own. Link to video 

This is my first test, its a mixed media miniature on poor quality paper roughly coated with my DIY absorbent ground. Link to video

Here's the results of the second test with two coats on shiny card. This gives a real surface to paint on, otherwise impossible on the shiny card. Link to video