Making a wall waterproof

[Sleepyfergus]

The rented house we love in has a dishwasher nest to a wall. When the dishwasher is open for loading, the bottom of the wall adjacent to it gets splashed with bits of food etc (blaming DH for 99% of this!) and it looks gross

We have the paint to tidy it up, but I wondered if once this is dry, could I paint on a pva/water mixture (say 2/3 layers drying inbetween each) so that it seals it. Then wiping that area of wall down afterwards should be easier

Sounds good in theory but have I not considered something?

I've had some stuff put on my kitchen walls to make them completely properly wipe able but I have completely forgotten what it is called! . Will update when it comes back.

Silk paint is wipeable,I have it in my kitchen.