

Lot of good points here. I work in electronics manufacturing so I’ll add on a bit. Yes, much of what has been explained about solder and flux is correct. I will caution about trying something like conformal coating a board in this setting. It is hard to work through and can beat up your iron. Lead free is great but sucks for working it into the joints. It just doesn’t heatt the same. Even IPC build standards have explicit instructions about visual inspections of non leaded joints looking like shit.
If you are planning to coat the board, I would do outdoors as well. Extraction fans are great for general soldering but we use fume hoods for conformal coat. Just something to keep in mind.
I am running Bazzite and Stellaris. I have no issues with stability or opening the game. Have you checked your hardware fundamentals and done things like disable steam overlay?