Classic Brands CLASSIC501 Replacement Flowers (7 per pack)

I'm in southern Arizona where we regularly have at least one nest of wasps in residence at all times as well as bees (we have a pond.) The resident hummers tend to go to my old Ruby feeder with the yellow flowers first so I've had to steal some yellow of of that one to put on my two newer (all white flowers.) The only issue I've ever had with my feeders is gnats crawling through the holes and the rare fungal growth (cleaned out with white vinegar and sunlight straight away!) Bees and wasps are more prone to check out my fresh laundry (laundry critics?) I've never seen them go to the feeders. Maybe they are too busy ganging up around the free pond water cafe to care? :) Do you recommend a type of paint I can use to paint the white flowers yellow? fyi that the 10-oz Ruby feeder is by far the best feeder I've found for ease of use and cleaning where only a small amount of nectar can be put out at a time due to excessive heat. In fact could do with only 5-oz.