Hi Michaelene,
Thank you so much for the kind words. 🙂
As much as I would love to say resin is the best choice here, I’m not sure that it is. All resins will eventually yellow. This process is sped up by UV light exposure, which it sounds like your flower will encounter. I would try to find something made for outdoor use (paint, varnish, etc.) to make your flower more element resistant.
If you do want to dry resin, yes, you can brush it on. Allow your piece to sit on wax paper and move the piece frequently to allow the drips not to pool under the piece. You can also try balancing it on something like this
https://www.resinobsession.com/forums/topic/looking-for-tray-to-help-with-dripping-resin
If you decide to give this a try, would you mind letting us know how it goes?