It's extremely important to prepare the wood before painting a basecoat.
If a wooden surface has holes or marks begin by filling them with wood putty following by manufacturer's instructions. When the putty is dry, sand the surface smooth and wipe it with a tack rag.
There are different types of wood which are used for painting but all of them absorb a paint very well. That's why before applying the basecoat I usually seal all wood with wood sealer . When it dries, sand and wipe it with a tack rag.
I also use the mixture of Carpenter's glue and water 50%x50%. as a wood sealer.