RCken is absolutely correct, sorry I didn't point that out.
Real good reference - If you can feel the imperfection/blemish with your fingers it will show through the covering.

So run your fingers over the cracks between the wood joints you mentioned above. If you can feel the cracks they will show through the covering.
Also remember that any pen or pencil marks you made to measure and cut wood pieces will show through as well. The black outer-edges from laser-cut wood and other manufacturer-made blemishes such as wood-knots (I have had many of those in sheeting material) will also show through.