I had a problem with the little black ants nesting between the wood and the metal wrap of my telescoping covers. I mixed cinnamon with veg oil and made a paste and smeared it around the edges of the lids. It worked [and smells good]. I left a little jelly jar of the stuff in the bee tool bucket in case I need it again. Should last a long time.
However, even though they don't nest, those blasted ants do find their way into the shims where I put my feeders and gather around the jars.
I'm going to try the borax jelly bottles inside the shims. Maybe that will get rid of them for good.