Best stirrer accessories according to redditors

You'll need something thin and flat to serve as a spatula. Wooden coffee stirrers are going to be the easiest to acquire (grab a handful the next time you're at a coffee shop) but they're not great. I use a lab spatula like this because it's non-reactive, non-porous, and has an effective lifespan of forever.

Don't pack the whole cavity with putty all at once; at best it will take forever to cure all the way through, and at worst it will soften the plastic around it. Fill it in in layers, allowing it to cure each time, and then when it's almost full put in an excess so you can sand and shape the surface to what you need. It's an exercise in patience, which is why it's not a great technique for large cavities; the cost in time and putty is prohibitive.

I use a microspatula.