My watercolour 'Toad with Cherry Blossom Petals' was the first watercolour I did on paper
that I mounted on panel. Read my article Mounting Paper on Wood on that.

This time I'm using a 12 mm thick MDF panel. As for now I taped the sides and gessoed the
front. Next is sanding the surface, remove any dust and glue the watercolour paper to the
panel.

When you mount paper on wood/ MDF there should be a protective layer of gesso between
the wood and paper because the acidic properties of wood will destroy the paper.

Also read the very elaborate blogpost by Kelly McKernan on mounting paper onto panel.
Her post was a great help.

🍃🍂