Those cards were in a very poor state, painting over the damaged parts has hidden most of the wear and tear. It has left a slight granulous texture, but the visual aspect is much better !
Here's a solution to hide some...damages !
Or remove a signature...what a strange idea ! :)
On the left, a ball point pen had left a deep mark on the card. After using paint remover, i had to fill in the gap. A single coat of smooth paint didn’t quite hide the damage, so i added the vegetation to create a texture.