My Kingdom for a Brush!
My good friend Midland purchased a bottle of layout fluid for me at the show. I had recently given back to him the one he had lent me for the past two years...
However, we used to get a brush included in the lid, but not any more, so I grabbed a small flat brush, cut off a section, machined a 3mm spigot on the end, drilled a hole in the lid, added some adhesive and screwed and glued a M3 nut on the other side.
Voila! The brush keeps moist, and there are no more gnarled and bushy brush heads full of dried out blue stuff!