Using a brush to apply UV resin?

I’m curious how everyone applies resin to their projects. I love the results I’ve been getting. But I’ve been squeezing some resin into a small Tupperware cup and using a paintbrush to apply it. But unless you leave the brush in the resin, it’s impossible to clean it. I tried “rinsing” the brush in alcohol but it doesn’t really work. Then I tried popsicle sticks which are disposable but they aren’t accurate enough.

Is there some kind of holding container or system you use? I feel like if I squeeze the resin out of the bottle tip (using Let’s Resin) it will not give you the control needed.