Cling film painting is so much fun on a rainy day and If done right it’s a mess free messy activity (A blessing for mums and dads!)
Cling film painting is also a great way to learn colours and learn more about colour mixing, here’s how we do it:

Wrap cling film around the table surface
cover the surface with paper
Apply large Blobs of paint to the paper
wrap a cover of layers of cling film over the paper
Use the palms of your hands and your fingertips to spread and mix the paint
be aware of rings or finger nails which could rip the cling film