Protecting / treating original shed timber before panelling Kitchens, doors, rails, stud, tables, chairs, stair cases, garden furniture etc... Find answers and ask questions here!

[willieferry]

I've recently bought a new shed. The original shed is untreated. However, i am planning to add panelling to rhe outside to give it a better finish. I'm just unsure if i should treat or paint the original timber before adding panels to it, or would the additional external panels (which i plan to paint) be protection enough?