I've used Billy book selves from Ikea to create a built-in unit along a wall. I am going to put the shelves up inline, then I need to fill the rest of the holes which are in the sides. After the holes are filled, it will be painted.
What would work better in this case to fill the holes? Painter's caulk or joint compound. I'm heavily leaning towards joint compound because it is sandable. I just want to ensure I'm not doing the wrong thing.