Yeah....I figured that out the hard way. I broke out the butane soldering iron, let it sit for about 20 minutes on full gas to get it hot, then it still had a little trouble. I'm amazed at how much the traces soak up the heat!

I did get the cap soldered on there though, and no damage to everything. ESC runs at around 110F with a 5v fan and the cap, and around 125F during the middle of the day with the same setup using a 4 pole motor geared high with Mashers. I'm also running way too low of a timing for the 4 pole motor, so it's not working as efficiently as it should and probably heats everything up a little more than it should.