Yeah, when you get all the framing done there's this moment of panic when you think, "AAACCK! I have a little uneven gap!!" Especially if your house has had any time to settle chances are everything isn't perfectly flush. And then you have these screws that aren't perfectly flush...
Have I identified that I am NOT a carpenter?? If you didn't guess it you'd know now. This is an imperfect project. After all it was built by yours truly. That doesn't mean that it doesn't look good or I'm not proud of it but I do know that a skilled carpenter would not have made my myriad of rookie mistakes.
For the nails I used a whipped putty to cover the holes. For the screws, I used a wood putty. This is a great molding putty that can turn screw heads into looking like little wooden knobs or smooth the surface. Again, if you have a nail gun I think that's preferable and then all you have to do is cover the holes with a little putty.
After that it's my favorite part- CAULK. I have come to love vinyl caulk- it covers all manner of sins. Gaps? vinyl caulk to the rescue! It seals everything and makes it a smooth, cohesive unit. You'll need two bottles of this and I recommend asking a worker at the hardware store which brand to get. That plus a caulk gun and you'll spend under $15 to elevate your bookshelves and really make them look finished. Look at the picture and see what it looks like before and after- amazing, right?
Next, I bought some semi-gloss white paint. For some reason it did nothing so I ended up taking my leftover matte white paint from the ceiling and painted two coats. Then I went over with a coat of the semi-gloss paint. I'd recommend two coats of that though.
Another day spent organizing my books and there's the finished product! All done for about $350.00