I didn't want to spray the board,
was looking at this
www.bunnings.com.au/search/products?q=self%20adhesive%20filmand this
www.bunnings.com.au/boyle-60cm-x-45cm-blackboard-self-adhesive-film_p1661249The above product is listed as waterproof but comes in limited colours.
Any suggestions, would be great, and if possible to remove later to sell the board.
Thanks.